[{"id":3677105,"web_url":"http://patchwork.ozlabs.org/comment/3677105/","msgid":"<6d5cc24a-f8c6-4daa-9e27-399dbb916fac@163.com>","list_archive_url":null,"date":"2026-04-14T10:07:09","subject":"Re: [PATCH v1] ext4: add mb_stats_clear for mballoc statistics","submitter":{"id":89479,"url":"http://patchwork.ozlabs.org/api/people/89479/","name":"liubaolin","email":"liubaolin12138@163.com"},"content":"> Dear all, \n> I have sent a small ext4 patch to add a manual reset capability for the mballoc statistics, and I would like to add some background on the motivation.\n> \n> The idea came mainly from XFS stats_clear.\n> ext4 already exports mballoc runtime statistics through /proc/fs/ext4//mb_stats, \n> but these counters keep accumulating from mount time, which makes it inconvenient when trying to observe allocator behavior for a single test run.\n> \n> This patch adds a write-only sysfs node, /sys/fs/ext4//mb_stats_clear, so that writing 1 to it resets the ext4 mballoc runtime statistics.\n> It also adds sbi->s_bal_allocated to /proc/fs/ext4//mb_stats, \n> so that the proc output matches the mballoc summary printed at unmount time and the set of counters covered by mb_stats_clear is more complete. \n> \n> The main goal is to make it easier to observe allocator activity for a specific test run instead of relying on counters accumulated since mount. \n> With this in place, the counters can be cleared before starting a test, and the resulting mb_stats output reflects only the activity generated by that test.\n> \n> The counters being cleared are runtime mballoc statistics used for /proc/fs/ext4//mb_stats reporting and for the mballoc summary printed at unmount time. \n> I did not find any cases where these fields are read back to drive ext4 behavior, so the reset only affects statistics reporting.\n> \n> For validation, /sys/fs/ext4//mb_stats can be enabled first, \n> then a file operation test can be run so that the relevant values in /proc/fs/ext4//mb_stats become non-zero. \n> After writing 1 to /sys/fs/ext4//mb_stats_clear, those values should return to 0. \n> Running another file operation test afterward should make those values increase again.\n> \n> Best regards,\n> Baolin Liu\n\n\n\n\n\n在 2026/4/14 18:02, Baolin Liu 写道:\n> From: Baolin Liu \n> \n> Add a write-only mb_stats_clear sysfs knob to reset ext4 mballoc\n> runtime statistics.This makes it easier to inspect allocator\n> activity for a specific workload instead of using counters\n> accumulated since mount.\n> \n> Signed-off-by: Baolin Liu \n> ---\n> fs/ext4/ext4.h | 1 +\n> fs/ext4/mballoc.c | 31 +++++++++++++++++++++++++++++++\n> fs/ext4/sysfs.c | 24 ++++++++++++++++++++++++\n> 3 files changed, 56 insertions(+)\n> \n> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h\n> index 7617e2d454ea..3a32e1a515dd 100644\n> --- a/fs/ext4/ext4.h\n> +++ b/fs/ext4/ext4.h\n> @@ -2995,6 +2995,7 @@ int ext4_fc_record_regions(struct super_block *sb, int ino,\n> extern const struct seq_operations ext4_mb_seq_groups_ops;\n> extern const struct seq_operations ext4_mb_seq_structs_summary_ops;\n> extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);\n> +extern void ext4_mb_stats_clear(struct ext4_sb_info *sbi);\n> extern int ext4_mb_init(struct super_block *);\n> extern void ext4_mb_release(struct super_block *);\n> extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,\n> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c\n> index bb58eafb87bc..382c91586b26 100644\n> --- a/fs/ext4/mballoc.c\n> +++ b/fs/ext4/mballoc.c\n> @@ -3219,6 +3219,8 @@ int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset)\n> \t}\n> \tseq_printf(seq, \"\\treqs: %u\\n\", atomic_read(&sbi->s_bal_reqs));\n> \tseq_printf(seq, \"\\tsuccess: %u\\n\", atomic_read(&sbi->s_bal_success));\n> +\tseq_printf(seq, \"\\tblocks_allocated: %u\\n\",\n> +\t\t atomic_read(&sbi->s_bal_allocated));\n> \n> \tseq_printf(seq, \"\\tgroups_scanned: %u\\n\",\n> \t\t atomic_read(&sbi->s_bal_groups_scanned));\n> @@ -4721,6 +4723,35 @@ static void ext4_mb_collect_stats(struct ext4_allocation_context *ac)\n> \t\ttrace_ext4_mballoc_prealloc(ac);\n> }\n> \n> +void ext4_mb_stats_clear(struct ext4_sb_info *sbi)\n> +{\n> +\tint i;\n> +\n> +\tatomic_set(&sbi->s_bal_reqs, 0);\n> +\tatomic_set(&sbi->s_bal_success, 0);\n> +\tatomic_set(&sbi->s_bal_allocated, 0);\n> +\tatomic_set(&sbi->s_bal_groups_scanned, 0);\n> +\n> +\tfor (i = 0; i < EXT4_MB_NUM_CRS; i++) {\n> +\t\tatomic64_set(&sbi->s_bal_cX_hits[i], 0);\n> +\t\tatomic64_set(&sbi->s_bal_cX_groups_considered[i], 0);\n> +\t\tatomic_set(&sbi->s_bal_cX_ex_scanned[i], 0);\n> +\t\tatomic64_set(&sbi->s_bal_cX_failed[i], 0);\n> +\t}\n> +\n> +\tatomic_set(&sbi->s_bal_ex_scanned, 0);\n> +\tatomic_set(&sbi->s_bal_goals, 0);\n> +\tatomic_set(&sbi->s_bal_stream_goals, 0);\n> +\tatomic_set(&sbi->s_bal_len_goals, 0);\n> +\tatomic_set(&sbi->s_bal_2orders, 0);\n> +\tatomic_set(&sbi->s_bal_breaks, 0);\n> +\tatomic_set(&sbi->s_mb_lost_chunks, 0);\n> +\tatomic_set(&sbi->s_mb_buddies_generated, 0);\n> +\tatomic64_set(&sbi->s_mb_generation_time, 0);\n> +\tatomic_set(&sbi->s_mb_preallocated, 0);\n> +\tatomic_set(&sbi->s_mb_discarded, 0);\n> +}\n> +\n> /*\n> * Called on failure; free up any blocks from the inode PA for this\n> * context. We don't need this for MB_GROUP_PA because we only change\n> diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c\n> index 923b375e017f..a5bd88a99f22 100644\n> --- a/fs/ext4/sysfs.c\n> +++ b/fs/ext4/sysfs.c\n> @@ -41,6 +41,7 @@ typedef enum {\n> \tattr_pointer_atomic,\n> \tattr_journal_task,\n> \tattr_err_report_sec,\n> +\tattr_mb_stats_clear,\n> } attr_id_t;\n> \n> typedef enum {\n> @@ -161,6 +162,25 @@ static ssize_t err_report_sec_store(struct ext4_sb_info *sbi,\n> \treturn count;\n> }\n> \n> +static ssize_t mb_stats_clear_store(struct ext4_sb_info *sbi,\n> +\t\t\t\t const char *buf, size_t count)\n> +{\n> +\tint val;\n> +\tint ret;\n> +\n> +\tif (!capable(CAP_SYS_ADMIN))\n> +\t\treturn -EPERM;\n> +\n> +\tret = kstrtoint(skip_spaces(buf), 0, &val);\n> +\tif (ret)\n> +\t\treturn ret;\n> +\tif (val != 1)\n> +\t\treturn -EINVAL;\n> +\n> +\text4_mb_stats_clear(sbi);\n> +\treturn count;\n> +}\n> +\n> static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)\n> {\n> \tif (!sbi->s_journal)\n> @@ -251,6 +271,7 @@ EXT4_ATTR_OFFSET(mb_best_avail_max_trim_order, 0644, mb_order,\n> EXT4_ATTR_OFFSET(err_report_sec, 0644, err_report_sec, ext4_sb_info, s_err_report_sec);\n> EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);\n> EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);\n> +EXT4_ATTR(mb_stats_clear, 0200, mb_stats_clear);\n> EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);\n> EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);\n> EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);\n> @@ -301,6 +322,7 @@ static struct attribute *ext4_attrs[] = {\n> \tATTR_LIST(inode_readahead_blks),\n> \tATTR_LIST(inode_goal),\n> \tATTR_LIST(mb_stats),\n> +\tATTR_LIST(mb_stats_clear),\n> \tATTR_LIST(mb_max_to_scan),\n> \tATTR_LIST(mb_min_to_scan),\n> \tATTR_LIST(mb_order2_req),\n> @@ -561,6 +583,8 @@ static ssize_t ext4_attr_store(struct kobject *kobj,\n> \t\treturn trigger_test_error(sbi, buf, len);\n> \tcase attr_err_report_sec:\n> \t\treturn err_report_sec_store(sbi, buf, len);\n> +\tcase attr_mb_stats_clear:\n> +\t\treturn mb_stats_clear_store(sbi, buf, len);\n> \tdefault:\n> \t\treturn ext4_generic_attr_store(a, sbi, buf, len);\n> \t}","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=163.com header.i=@163.com header.a=rsa-sha256\n header.s=s110527 header.b=f92Z1q+Z;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","X-CM-TRANSID":"_____wCHaz_NEd5p25gyFA--.63943S2","X-Coremail-Antispam":"1Uf129KBjvJXoW3GFWDWr1UCw13JFy5WryDWrg_yoWxtFWUpF\n\tsxXa4UAF4UZ3Wxurs7Wa18WwnYvw40k3yUWrnIvw1F9FZIqryftFySqryjvFy5ArW8X3W8\n\tXa1Yv3yDGrWj937anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07Uza0QUUUUU=","X-CM-SenderInfo":"xolxutxrol0iasrtmqqrwthudrp/xtbC6RaLVmneEdYjDQAA38","X-Spam-Status":"No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tFREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"}},{"id":3677799,"web_url":"http://patchwork.ozlabs.org/comment/3677799/","msgid":"","list_archive_url":null,"date":"2026-04-15T19:26:58","subject":"Re: [PATCH v1] ext4: add mb_stats_clear for mballoc statistics","submitter":{"id":83422,"url":"http://patchwork.ozlabs.org/api/people/83422/","name":"Ojaswin Mujoo","email":"ojaswin@linux.ibm.com"},"content":"On Tue, Apr 14, 2026 at 06:02:11PM +0800, Baolin Liu wrote:\n> From: Baolin Liu \n> \n> Add a write-only mb_stats_clear sysfs knob to reset ext4 mballoc\n> runtime statistics.This makes it easier to inspect allocator\n> activity for a specific workload instead of using counters\n> accumulated since mount.\n> \n> Signed-off-by: Baolin Liu \n\nThe patch looks good to me Baolin. We just need to add documentation of\nthis to the Documentation/ABI/testing/sysfs-fs-ext4 file so that the\nusers know what it is and the fact that the only value we allow to write\nis 1. \n\nRegards,\nojaswin","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=NTJkmXv9;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=150.107.74.76; helo=mail.ozlabs.org;\n envelope-from=srs0=suqo=co=vger.kernel.org=linux-ext4+bounces-15850-patchwork-incoming=ozlabs.org@ozlabs.org;\n receiver=patchwork.ozlabs.org)","gandalf.ozlabs.org;\n arc=pass smtp.remote-ip=\"2600:3c04:e001:36c::12fc:5321\"\n arc.chain=subspace.kernel.org","gandalf.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=linux.ibm.com","gandalf.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=NTJkmXv9;\n\tdkim-atps=neutral","gandalf.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; 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charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260414100212.95209-1-liubaolin12138@163.com>","X-TM-AS-GCONF":"00","X-Proofpoint-Reinject":"loops=2 maxloops=12","X-Proofpoint-GUID":"ix5iUEyB-wPr_UgVJeh11OHM2xRKuNql","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDE1MDE4MCBTYWx0ZWRfX8suWA81L5td0\n 2zCNQo5IsIkOLhxo7ec7bnh6ysEelF4mtIcJ/YwxXSQlkGxuSVZVK2PNF7TJ2SN1yurU1USzKAl\n T7NNngczUKntqFBNGXIUVO15sVmSnvnOS1EskQlpxuZQdy8Xf+qqSUhSNgdTwzl3BlwRjBE6Cjr\n I8uvgnuuVhpIZv0144XPZn6TIxANTBmRSLinRd6L7kOAEl4lFioyxSLrhJbBZS77HWDp75L2UvQ\n j4YAbLVNK7b6hDbalTmas3E6Q1urlIOqA4iN0XTx3xi5a3hyCco8l67jNTOP9ACL3/dmVEjLX+6\n 7BmWUwe2Jbra9j/UTQivtCfCIWXz4+c7Jm9WAUJNOLZbTWQw6G1uk8Kl5NytcuA6+OdQXxarZKn\n INpMn46PJRWIh4X68jv8BBslgdlYlpjSMpKR9KiXj02ISIGl6Ks+RYadThPSS+lBEjllUAbkcp+\n Uv0QPsEoOsGCs3U6Zcg==","X-Proofpoint-ORIG-GUID":"XrqOsl1uQFRV9dDDYmaToKkNXeqqTSOp","X-Authority-Analysis":"v=2.4 cv=FY4HAp+6 c=1 sm=1 tr=0 ts=69dfe68b cx=c_pps\n a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17\n a=kj9zAlcOel0A:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=KrRLzkSUTx881rGj9LEA:9\n a=CjuIK1q_8ugA:10","X-Proofpoint-Virus-Version":"vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-15_01,2026-04-13_04,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n adultscore=0 priorityscore=1501 bulkscore=0 impostorscore=0 spamscore=0\n lowpriorityscore=0 suspectscore=0 clxscore=1011 malwarescore=0 phishscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604150180","X-Spam-Status":"No, score=-1.1 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIM_SIGNED,DKIM_VALID,DMARC_PASS,HEADER_FROM_DIFFERENT_DOMAINS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"}},{"id":3677887,"web_url":"http://patchwork.ozlabs.org/comment/3677887/","msgid":"","list_archive_url":null,"date":"2026-04-16T01:14:38","subject":"Re: [PATCH v1] ext4: add mb_stats_clear for mballoc statistics","submitter":{"id":4514,"url":"http://patchwork.ozlabs.org/api/people/4514/","name":"Andreas Dilger","email":"adilger@dilger.ca"},"content":"On Apr 14, 2026, at 04:02, Baolin Liu wrote:\n> \n> From: Baolin Liu \n> \n> Add a write-only mb_stats_clear sysfs knob to reset ext4 mballoc\n> runtime statistics. This makes it easier to inspect allocator\n> activity for a specific workload instead of using counters\n> accumulated since mount.\n\nRather than having a read-only \"mb_stats\" procfs file and a separate\nwrite-only \"mb_stats_clear\" sysfs file to clear \"mb_stats\", IMHO it\nwould be more obvious to write directly to \"/proc/fs/ext4/DEV/mb_stats\"\nfile to clear it. Writing \"0\" would be logical to zero out the stats.\n\nCheers, Andreas\n\n> \n> Signed-off-by: Baolin Liu \n> ---\n> fs/ext4/ext4.h | 1 +\n> fs/ext4/mballoc.c | 31 +++++++++++++++++++++++++++++++\n> fs/ext4/sysfs.c | 24 ++++++++++++++++++++++++\n> 3 files changed, 56 insertions(+)\n> \n> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h\n> index 7617e2d454ea..3a32e1a515dd 100644\n> --- a/fs/ext4/ext4.h\n> +++ b/fs/ext4/ext4.h\n> @@ -2995,6 +2995,7 @@ int ext4_fc_record_regions(struct super_block *sb, int ino,\n> extern const struct seq_operations ext4_mb_seq_groups_ops;\n> extern const struct seq_operations ext4_mb_seq_structs_summary_ops;\n> extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);\n> +extern void ext4_mb_stats_clear(struct ext4_sb_info *sbi);\n> extern int ext4_mb_init(struct super_block *);\n> extern void ext4_mb_release(struct super_block *);\n> extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,\n> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c\n> index bb58eafb87bc..382c91586b26 100644\n> --- a/fs/ext4/mballoc.c\n> +++ b/fs/ext4/mballoc.c\n> @@ -3219,6 +3219,8 @@ int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset)\n> }\n> seq_printf(seq, \"\\treqs: %u\\n\", atomic_read(&sbi->s_bal_reqs));\n> seq_printf(seq, \"\\tsuccess: %u\\n\", atomic_read(&sbi->s_bal_success));\n> + seq_printf(seq, \"\\tblocks_allocated: %u\\n\",\n> + atomic_read(&sbi->s_bal_allocated));\n> \n> seq_printf(seq, \"\\tgroups_scanned: %u\\n\",\n> atomic_read(&sbi->s_bal_groups_scanned));\n> @@ -4721,6 +4723,35 @@ static void ext4_mb_collect_stats(struct ext4_allocation_context *ac)\n> trace_ext4_mballoc_prealloc(ac);\n> }\n> \n> +void ext4_mb_stats_clear(struct ext4_sb_info *sbi)\n> +{\n> + int i;\n> +\n> + atomic_set(&sbi->s_bal_reqs, 0);\n> + atomic_set(&sbi->s_bal_success, 0);\n> + atomic_set(&sbi->s_bal_allocated, 0);\n> + atomic_set(&sbi->s_bal_groups_scanned, 0);\n> +\n> + for (i = 0; i < EXT4_MB_NUM_CRS; i++) {\n> + atomic64_set(&sbi->s_bal_cX_hits[i], 0);\n> + atomic64_set(&sbi->s_bal_cX_groups_considered[i], 0);\n> + atomic_set(&sbi->s_bal_cX_ex_scanned[i], 0);\n> + atomic64_set(&sbi->s_bal_cX_failed[i], 0);\n> + }\n> +\n> + atomic_set(&sbi->s_bal_ex_scanned, 0);\n> + atomic_set(&sbi->s_bal_goals, 0);\n> + atomic_set(&sbi->s_bal_stream_goals, 0);\n> + atomic_set(&sbi->s_bal_len_goals, 0);\n> + atomic_set(&sbi->s_bal_2orders, 0);\n> + atomic_set(&sbi->s_bal_breaks, 0);\n> + atomic_set(&sbi->s_mb_lost_chunks, 0);\n> + atomic_set(&sbi->s_mb_buddies_generated, 0);\n> + atomic64_set(&sbi->s_mb_generation_time, 0);\n> + atomic_set(&sbi->s_mb_preallocated, 0);\n> + atomic_set(&sbi->s_mb_discarded, 0);\n> +}\n> +\n> /*\n> * Called on failure; free up any blocks from the inode PA for this\n> * context. We don't need this for MB_GROUP_PA because we only change\n> diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c\n> index 923b375e017f..a5bd88a99f22 100644\n> --- a/fs/ext4/sysfs.c\n> +++ b/fs/ext4/sysfs.c\n> @@ -41,6 +41,7 @@ typedef enum {\n> attr_pointer_atomic,\n> attr_journal_task,\n> attr_err_report_sec,\n> + attr_mb_stats_clear,\n> } attr_id_t;\n> \n> typedef enum {\n> @@ -161,6 +162,25 @@ static ssize_t err_report_sec_store(struct ext4_sb_info *sbi,\n> return count;\n> }\n> \n> +static ssize_t mb_stats_clear_store(struct ext4_sb_info *sbi,\n> + const char *buf, size_t count)\n> +{\n> + int val;\n> + int ret;\n> +\n> + if (!capable(CAP_SYS_ADMIN))\n> + return -EPERM;\n> +\n> + ret = kstrtoint(skip_spaces(buf), 0, &val);\n> + if (ret)\n> + return ret;\n> + if (val != 1)\n> + return -EINVAL;\n> +\n> + ext4_mb_stats_clear(sbi);\n> + return count;\n> +}\n> +\n> static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)\n> {\n> if (!sbi->s_journal)\n> @@ -251,6 +271,7 @@ EXT4_ATTR_OFFSET(mb_best_avail_max_trim_order, 0644, mb_order,\n> EXT4_ATTR_OFFSET(err_report_sec, 0644, err_report_sec, ext4_sb_info, s_err_report_sec);\n> EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);\n> EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);\n> +EXT4_ATTR(mb_stats_clear, 0200, mb_stats_clear);\n> EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);\n> EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);\n> EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);\n> @@ -301,6 +322,7 @@ static struct attribute *ext4_attrs[] = {\n> ATTR_LIST(inode_readahead_blks),\n> ATTR_LIST(inode_goal),\n> ATTR_LIST(mb_stats),\n> + ATTR_LIST(mb_stats_clear),\n> ATTR_LIST(mb_max_to_scan),\n> ATTR_LIST(mb_min_to_scan),\n> ATTR_LIST(mb_order2_req),\n> @@ -561,6 +583,8 @@ static ssize_t ext4_attr_store(struct kobject *kobj,\n> return trigger_test_error(sbi, buf, len);\n> case attr_err_report_sec:\n> return err_report_sec_store(sbi, buf, len);\n> + case attr_mb_stats_clear:\n> + return mb_stats_clear_store(sbi, buf, len);\n> default:\n> return ext4_generic_attr_store(a, sbi, buf, len);\n> }\n> -- \n> 2.51.0\n> \n\n\nCheers, Andreas","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=dilger-ca.20251104.gappssmtp.com\n header.i=@dilger-ca.20251104.gappssmtp.com header.a=rsa-sha256\n header.s=20251104 header.b=PyNJc5+S;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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The changes looks good and works fine at my end.\nSo please feel free to add:\n\nReviewed-by: Ritesh Harjani (IBM) ","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=RXwyiKYz;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; helo=mail.ozlabs.org;\n envelope-from=srs0=6+1s=cp=vger.kernel.org=linux-ext4+bounces-15854-patchwork-incoming=ozlabs.org@ozlabs.org;\n receiver=patchwork.ozlabs.org)","gandalf.ozlabs.org;\n arc=pass smtp.remote-ip=\"2600:3c09:e001:a7::12fc:5321\"\n arc.chain=subspace.kernel.org","gandalf.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","gandalf.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=RXwyiKYz;\n\tdkim-atps=neutral","gandalf.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c09:e001:a7::12fc:5321; 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I will revise the patch according to Andreas's comments and submit a second version. \n> When submitting the second version, I will also update the relevant files under the Documentation directory according to your suggestions to add explanations.\n> \n> Regards,\n> Baolin\n\n\n\n在 2026/4/16 3:26, Ojaswin Mujoo 写道:\n> On Tue, Apr 14, 2026 at 06:02:11PM +0800, Baolin Liu wrote:\n>> From: Baolin Liu \n>>\n>> Add a write-only mb_stats_clear sysfs knob to reset ext4 mballoc\n>> runtime statistics.This makes it easier to inspect allocator\n>> activity for a specific workload instead of using counters\n>> accumulated since mount.\n>>\n>> Signed-off-by: Baolin Liu \n> \n> The patch looks good to me Baolin. We just need to add documentation of\n> this to the Documentation/ABI/testing/sysfs-fs-ext4 file so that the\n> users know what it is and the fact that the only value we allow to write\n> is 1.\n> \n> Regards,\n> ojaswin","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=163.com header.i=@163.com header.a=rsa-sha256\n header.s=s110527 header.b=ETXKgzWs;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; helo=mail.ozlabs.org;\n envelope-from=srs0=c9xz=cp=vger.kernel.org=linux-ext4+bounces-15859-patchwork-incoming=ozlabs.org@ozlabs.org;\n receiver=patchwork.ozlabs.org)","gandalf.ozlabs.org;\n arc=pass smtp.remote-ip=\"2600:3c09:e001:a7::12fc:5321\"\n arc.chain=subspace.kernel.org","gandalf.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=163.com","gandalf.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=163.com header.i=@163.com header.a=rsa-sha256\n header.s=s110527 header.b=ETXKgzWs;\n\tdkim-atps=neutral","gandalf.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c09:e001:a7::12fc:5321; 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arc=none smtp.client-ip=220.197.31.3"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com;\n\ts=s110527; h=Message-ID:Date:MIME-Version:Subject:To:From:\n\tContent-Type; bh=LFPNGPaENT/hBl+GocrWQH8+ip14PqtZctiPRBXxdLA=;\n\tb=ETXKgzWsGjk91qCDdd62axe4zVADUpTgnQ2eaCK5fo+zjTGCpDFTE/chXj7irv\n\tjhag5RqBbudJQb5QkTC8GdMgJgeCXfugpr9T5jasAwPiN3j+KTdnOfkBWh3Ifi46\n\tiXhzTCIKSa406Ik95GtggkheKgEv+NPgUv2KqeOgCushA=","Message-ID":"","Date":"Thu, 16 Apr 2026 15:07:28 +0800","Precedence":"bulk","X-Mailing-List":"linux-ext4@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","User-Agent":"Mozilla Thunderbird","Subject":"Re: [PATCH v1] ext4: add mb_stats_clear for mballoc statistics","To":"Ojaswin Mujoo ","Cc":"tytso@mit.edu, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org,\n linux-kernel@vger.kernel.org, wangguanyu@vivo.com,\n Baolin Liu ","References":"<20260414100212.95209-1-liubaolin12138@163.com>\n ","From":"liubaolin ","In-Reply-To":"\n ","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","X-CM-TRANSID":"_____wDHcf+4iuBpJw0iFg--.26284S2","X-Coremail-Antispam":"1Uf129KBjvdXoW7Wr4xZF45uFWfuF15Ww4fAFb_yoWDWrgE9r\n\t18tFs7C3ZFqF1kJa1fCr18WFZY9FZ29ryDJwn5JFs3W34YvanYkrZ5WrZ0yF17WFW09rZ3\n\tWF4rXasxAFnFqjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT\n\t9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IUjtrcPUUUUU==","X-CM-SenderInfo":"xolxutxrol0iasrtmqqrwthudrp/xtbCwh1kL2ngir2GUAAA38","X-Spam-Status":"No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tFREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"}},{"id":3677965,"web_url":"http://patchwork.ozlabs.org/comment/3677965/","msgid":"<15dddf71-1f8c-45eb-9333-fb2e9174004d@163.com>","list_archive_url":null,"date":"2026-04-16T07:11:45","subject":"Re: [PATCH v1] ext4: add mb_stats_clear for mballoc statistics","submitter":{"id":89479,"url":"http://patchwork.ozlabs.org/api/people/89479/","name":"liubaolin","email":"liubaolin12138@163.com"},"content":"> Dear Andreas,\n> Alright, thank you for your review. \n> I will revise the patch according to your suggestions and submit a second version as soon as possible.\n> \n> Regards,\n> Baolin\n\n\n\n在 2026/4/16 9:14, Andreas Dilger 写道:\n> On Apr 14, 2026, at 04:02, Baolin Liu wrote:\n>>\n>> From: Baolin Liu \n>>\n>> Add a write-only mb_stats_clear sysfs knob to reset ext4 mballoc\n>> runtime statistics. This makes it easier to inspect allocator\n>> activity for a specific workload instead of using counters\n>> accumulated since mount.\n> \n> Rather than having a read-only \"mb_stats\" procfs file and a separate\n> write-only \"mb_stats_clear\" sysfs file to clear \"mb_stats\", IMHO it\n> would be more obvious to write directly to \"/proc/fs/ext4/DEV/mb_stats\"\n> file to clear it. Writing \"0\" would be logical to zero out the stats.\n> \n> Cheers, Andreas\n> \n>>\n>> Signed-off-by: Baolin Liu \n>> ---\n>> fs/ext4/ext4.h | 1 +\n>> fs/ext4/mballoc.c | 31 +++++++++++++++++++++++++++++++\n>> fs/ext4/sysfs.c | 24 ++++++++++++++++++++++++\n>> 3 files changed, 56 insertions(+)\n>>\n>> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h\n>> index 7617e2d454ea..3a32e1a515dd 100644\n>> --- a/fs/ext4/ext4.h\n>> +++ b/fs/ext4/ext4.h\n>> @@ -2995,6 +2995,7 @@ int ext4_fc_record_regions(struct super_block *sb, int ino,\n>> extern const struct seq_operations ext4_mb_seq_groups_ops;\n>> extern const struct seq_operations ext4_mb_seq_structs_summary_ops;\n>> extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);\n>> +extern void ext4_mb_stats_clear(struct ext4_sb_info *sbi);\n>> extern int ext4_mb_init(struct super_block *);\n>> extern void ext4_mb_release(struct super_block *);\n>> extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,\n>> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c\n>> index bb58eafb87bc..382c91586b26 100644\n>> --- a/fs/ext4/mballoc.c\n>> +++ b/fs/ext4/mballoc.c\n>> @@ -3219,6 +3219,8 @@ int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset)\n>> }\n>> seq_printf(seq, \"\\treqs: %u\\n\", atomic_read(&sbi->s_bal_reqs));\n>> seq_printf(seq, \"\\tsuccess: %u\\n\", atomic_read(&sbi->s_bal_success));\n>> + seq_printf(seq, \"\\tblocks_allocated: %u\\n\",\n>> + atomic_read(&sbi->s_bal_allocated));\n>>\n>> seq_printf(seq, \"\\tgroups_scanned: %u\\n\",\n>> atomic_read(&sbi->s_bal_groups_scanned));\n>> @@ -4721,6 +4723,35 @@ static void ext4_mb_collect_stats(struct ext4_allocation_context *ac)\n>> trace_ext4_mballoc_prealloc(ac);\n>> }\n>>\n>> +void ext4_mb_stats_clear(struct ext4_sb_info *sbi)\n>> +{\n>> + int i;\n>> +\n>> + atomic_set(&sbi->s_bal_reqs, 0);\n>> + atomic_set(&sbi->s_bal_success, 0);\n>> + atomic_set(&sbi->s_bal_allocated, 0);\n>> + atomic_set(&sbi->s_bal_groups_scanned, 0);\n>> +\n>> + for (i = 0; i < EXT4_MB_NUM_CRS; i++) {\n>> + atomic64_set(&sbi->s_bal_cX_hits[i], 0);\n>> + atomic64_set(&sbi->s_bal_cX_groups_considered[i], 0);\n>> + atomic_set(&sbi->s_bal_cX_ex_scanned[i], 0);\n>> + atomic64_set(&sbi->s_bal_cX_failed[i], 0);\n>> + }\n>> +\n>> + atomic_set(&sbi->s_bal_ex_scanned, 0);\n>> + atomic_set(&sbi->s_bal_goals, 0);\n>> + atomic_set(&sbi->s_bal_stream_goals, 0);\n>> + atomic_set(&sbi->s_bal_len_goals, 0);\n>> + atomic_set(&sbi->s_bal_2orders, 0);\n>> + atomic_set(&sbi->s_bal_breaks, 0);\n>> + atomic_set(&sbi->s_mb_lost_chunks, 0);\n>> + atomic_set(&sbi->s_mb_buddies_generated, 0);\n>> + atomic64_set(&sbi->s_mb_generation_time, 0);\n>> + atomic_set(&sbi->s_mb_preallocated, 0);\n>> + atomic_set(&sbi->s_mb_discarded, 0);\n>> +}\n>> +\n>> /*\n>> * Called on failure; free up any blocks from the inode PA for this\n>> * context. We don't need this for MB_GROUP_PA because we only change\n>> diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c\n>> index 923b375e017f..a5bd88a99f22 100644\n>> --- a/fs/ext4/sysfs.c\n>> +++ b/fs/ext4/sysfs.c\n>> @@ -41,6 +41,7 @@ typedef enum {\n>> attr_pointer_atomic,\n>> attr_journal_task,\n>> attr_err_report_sec,\n>> + attr_mb_stats_clear,\n>> } attr_id_t;\n>>\n>> typedef enum {\n>> @@ -161,6 +162,25 @@ static ssize_t err_report_sec_store(struct ext4_sb_info *sbi,\n>> return count;\n>> }\n>>\n>> +static ssize_t mb_stats_clear_store(struct ext4_sb_info *sbi,\n>> + const char *buf, size_t count)\n>> +{\n>> + int val;\n>> + int ret;\n>> +\n>> + if (!capable(CAP_SYS_ADMIN))\n>> + return -EPERM;\n>> +\n>> + ret = kstrtoint(skip_spaces(buf), 0, &val);\n>> + if (ret)\n>> + return ret;\n>> + if (val != 1)\n>> + return -EINVAL;\n>> +\n>> + ext4_mb_stats_clear(sbi);\n>> + return count;\n>> +}\n>> +\n>> static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)\n>> {\n>> if (!sbi->s_journal)\n>> @@ -251,6 +271,7 @@ EXT4_ATTR_OFFSET(mb_best_avail_max_trim_order, 0644, mb_order,\n>> EXT4_ATTR_OFFSET(err_report_sec, 0644, err_report_sec, ext4_sb_info, s_err_report_sec);\n>> EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);\n>> EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);\n>> +EXT4_ATTR(mb_stats_clear, 0200, mb_stats_clear);\n>> EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);\n>> EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);\n>> EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);\n>> @@ -301,6 +322,7 @@ static struct attribute *ext4_attrs[] = {\n>> ATTR_LIST(inode_readahead_blks),\n>> ATTR_LIST(inode_goal),\n>> ATTR_LIST(mb_stats),\n>> + ATTR_LIST(mb_stats_clear),\n>> ATTR_LIST(mb_max_to_scan),\n>> ATTR_LIST(mb_min_to_scan),\n>> ATTR_LIST(mb_order2_req),\n>> @@ -561,6 +583,8 @@ static ssize_t ext4_attr_store(struct kobject *kobj,\n>> return trigger_test_error(sbi, buf, len);\n>> case attr_err_report_sec:\n>> return err_report_sec_store(sbi, buf, len);\n>> + case attr_mb_stats_clear:\n>> + return mb_stats_clear_store(sbi, buf, len);\n>> default:\n>> return ext4_generic_attr_store(a, sbi, buf, len);\n>> }\n>> -- \n>> 2.51.0\n>>\n> \n> \n> Cheers, Andreas\n> \n> \n> \n>","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=163.com header.i=@163.com header.a=rsa-sha256\n header.s=s110527 header.b=dDeQvWzY;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","X-CM-TRANSID":"_____wAXw4q4i+BpvvYOFQ--.32909S2","X-Coremail-Antispam":"1Uf129KBjvJXoW3Gr4xZrWDJrWkAr1UZryfXrb_yoW7Kw48pa\n\tn8Jay5CF4UX3Wxurs7Wa18W3ZYyw40kFyUKr4Sy3WI9FZIvr9ayFyIgFy09Fy5ArWUC3Wv\n\tv3WjvrZrWr4Fga7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07Uca9-UUUUU=","X-CM-SenderInfo":"xolxutxrol0iasrtmqqrwthudrp/xtbC6QClcGngi8Dz5gAA3r","X-Spam-Status":"No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tFREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"}},{"id":3677967,"web_url":"http://patchwork.ozlabs.org/comment/3677967/","msgid":"<0e075abc-11f2-40f3-9dd3-566cd54a2bae@163.com>","list_archive_url":null,"date":"2026-04-16T07:16:08","subject":"Re: [PATCH v1] ext4: add mb_stats_clear for mballoc statistics","submitter":{"id":89479,"url":"http://patchwork.ozlabs.org/api/people/89479/","name":"liubaolin","email":"liubaolin12138@163.com"},"content":"> Dear Ritesh,\n> Thank you for your review. I will revise the patch according to Andreas's comments and submit a second version. \n> When the second version is submitted, you are welcome to review it. \n> Once the patch is finalized, the maintainer will add the Reviewed-by tag.\n> \n> Regards,\n> Baolin\n\n\n\n在 2026/4/16 9:44, Ritesh Harjani (IBM) 写道:\n> Baolin Liu writes:\n> \n>> From: Baolin Liu \n>>\n>> Add a write-only mb_stats_clear sysfs knob to reset ext4 mballoc\n>> runtime statistics.This makes it easier to inspect allocator\n>> activity for a specific workload instead of using counters\n>> accumulated since mount.\n>>\n>> Signed-off-by: Baolin Liu \n> \n> Make sense to me. The changes looks good and works fine at my end.\n> So please feel free to add:\n> \n> Reviewed-by: Ritesh Harjani (IBM) ","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=163.com header.i=@163.com header.a=rsa-sha256\n header.s=s110527 header.b=VMyj2cX0;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; helo=mail.ozlabs.org;\n envelope-from=srs0=ylsh=cp=vger.kernel.org=linux-ext4+bounces-15861-patchwork-incoming=ozlabs.org@ozlabs.org;\n receiver=patchwork.ozlabs.org)","gandalf.ozlabs.org;\n arc=pass smtp.remote-ip=172.105.105.114 arc.chain=subspace.kernel.org","gandalf.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=163.com","gandalf.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=163.com header.i=@163.com header.a=rsa-sha256\n header.s=s110527 header.b=VMyj2cX0;\n\tdkim-atps=neutral","gandalf.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.105.105.114; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","X-CM-TRANSID":"_____wAnTjfAjOBpj93QFQ--.34787S2","X-Coremail-Antispam":"1Uf129KBjvdXoW7Wr4xJrWxZry3AF1kWw4fuFg_yoWfWFb_WF\n\tWYyrn7WF4UtF4xGan3Cr1xGrZY9Fy2vFs8t3s5Arn5Gas093ZYvF95WrsIvr18GF409Fs3\n\ttan7XF9ayFy7ujkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT\n\t9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IUjJ5r3UUUUU==","X-CM-SenderInfo":"xolxutxrol0iasrtmqqrwthudrp/xtbC6hfqtWngjNcoKAAA3w","X-Spam-Status":"No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tFREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"}},{"id":3678023,"web_url":"http://patchwork.ozlabs.org/comment/3678023/","msgid":"<669739fd-688a-44e0-9ee7-1378960f1f65@huaweicloud.com>","list_archive_url":null,"date":"2026-04-16T08:53:46","subject":"Re: [PATCH v1] ext4: add mb_stats_clear for mballoc statistics","submitter":{"id":85428,"url":"http://patchwork.ozlabs.org/api/people/85428/","name":"Zhang Yi","email":"yi.zhang@huaweicloud.com"},"content":"On 4/14/2026 6:02 PM, Baolin Liu wrote:\n> From: Baolin Liu \n> \n> Add a write-only mb_stats_clear sysfs knob to reset ext4 mballoc\n> runtime statistics.This makes it easier to inspect allocator\n> activity for a specific workload instead of using counters\n> accumulated since mount.\n> \n> Signed-off-by: Baolin Liu \n\nLooks good to me!\n\nReviewed-by: Zhang Yi \n\n> ---\n> fs/ext4/ext4.h | 1 +\n> fs/ext4/mballoc.c | 31 +++++++++++++++++++++++++++++++\n> fs/ext4/sysfs.c | 24 ++++++++++++++++++++++++\n> 3 files changed, 56 insertions(+)\n> \n> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h\n> index 7617e2d454ea..3a32e1a515dd 100644\n> --- a/fs/ext4/ext4.h\n> +++ b/fs/ext4/ext4.h\n> @@ -2995,6 +2995,7 @@ int ext4_fc_record_regions(struct super_block *sb, int ino,\n> extern const struct seq_operations ext4_mb_seq_groups_ops;\n> extern const struct seq_operations ext4_mb_seq_structs_summary_ops;\n> extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);\n> +extern void ext4_mb_stats_clear(struct ext4_sb_info *sbi);\n> extern int ext4_mb_init(struct super_block *);\n> extern void ext4_mb_release(struct super_block *);\n> extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,\n> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c\n> index bb58eafb87bc..382c91586b26 100644\n> --- a/fs/ext4/mballoc.c\n> +++ b/fs/ext4/mballoc.c\n> @@ -3219,6 +3219,8 @@ int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset)\n> \t}\n> \tseq_printf(seq, \"\\treqs: %u\\n\", atomic_read(&sbi->s_bal_reqs));\n> \tseq_printf(seq, \"\\tsuccess: %u\\n\", atomic_read(&sbi->s_bal_success));\n> +\tseq_printf(seq, \"\\tblocks_allocated: %u\\n\",\n> +\t\t atomic_read(&sbi->s_bal_allocated));\n> \n> \tseq_printf(seq, \"\\tgroups_scanned: %u\\n\",\n> \t\t atomic_read(&sbi->s_bal_groups_scanned));\n> @@ -4721,6 +4723,35 @@ static void ext4_mb_collect_stats(struct ext4_allocation_context *ac)\n> \t\ttrace_ext4_mballoc_prealloc(ac);\n> }\n> \n> +void ext4_mb_stats_clear(struct ext4_sb_info *sbi)\n> +{\n> +\tint i;\n> +\n> +\tatomic_set(&sbi->s_bal_reqs, 0);\n> +\tatomic_set(&sbi->s_bal_success, 0);\n> +\tatomic_set(&sbi->s_bal_allocated, 0);\n> +\tatomic_set(&sbi->s_bal_groups_scanned, 0);\n> +\n> +\tfor (i = 0; i < EXT4_MB_NUM_CRS; i++) {\n> +\t\tatomic64_set(&sbi->s_bal_cX_hits[i], 0);\n> +\t\tatomic64_set(&sbi->s_bal_cX_groups_considered[i], 0);\n> +\t\tatomic_set(&sbi->s_bal_cX_ex_scanned[i], 0);\n> +\t\tatomic64_set(&sbi->s_bal_cX_failed[i], 0);\n> +\t}\n> +\n> +\tatomic_set(&sbi->s_bal_ex_scanned, 0);\n> +\tatomic_set(&sbi->s_bal_goals, 0);\n> +\tatomic_set(&sbi->s_bal_stream_goals, 0);\n> +\tatomic_set(&sbi->s_bal_len_goals, 0);\n> +\tatomic_set(&sbi->s_bal_2orders, 0);\n> +\tatomic_set(&sbi->s_bal_breaks, 0);\n> +\tatomic_set(&sbi->s_mb_lost_chunks, 0);\n> +\tatomic_set(&sbi->s_mb_buddies_generated, 0);\n> +\tatomic64_set(&sbi->s_mb_generation_time, 0);\n> +\tatomic_set(&sbi->s_mb_preallocated, 0);\n> +\tatomic_set(&sbi->s_mb_discarded, 0);\n> +}\n> +\n> /*\n> * Called on failure; free up any blocks from the inode PA for this\n> * context. We don't need this for MB_GROUP_PA because we only change\n> diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c\n> index 923b375e017f..a5bd88a99f22 100644\n> --- a/fs/ext4/sysfs.c\n> +++ b/fs/ext4/sysfs.c\n> @@ -41,6 +41,7 @@ typedef enum {\n> \tattr_pointer_atomic,\n> \tattr_journal_task,\n> \tattr_err_report_sec,\n> +\tattr_mb_stats_clear,\n> } attr_id_t;\n> \n> typedef enum {\n> @@ -161,6 +162,25 @@ static ssize_t err_report_sec_store(struct ext4_sb_info *sbi,\n> \treturn count;\n> }\n> \n> +static ssize_t mb_stats_clear_store(struct ext4_sb_info *sbi,\n> +\t\t\t\t const char *buf, size_t count)\n> +{\n> +\tint val;\n> +\tint ret;\n> +\n> +\tif (!capable(CAP_SYS_ADMIN))\n> +\t\treturn -EPERM;\n> +\n> +\tret = kstrtoint(skip_spaces(buf), 0, &val);\n> +\tif (ret)\n> +\t\treturn ret;\n> +\tif (val != 1)\n> +\t\treturn -EINVAL;\n> +\n> +\text4_mb_stats_clear(sbi);\n> +\treturn count;\n> +}\n> +\n> static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)\n> {\n> \tif (!sbi->s_journal)\n> @@ -251,6 +271,7 @@ EXT4_ATTR_OFFSET(mb_best_avail_max_trim_order, 0644, mb_order,\n> EXT4_ATTR_OFFSET(err_report_sec, 0644, err_report_sec, ext4_sb_info, s_err_report_sec);\n> EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);\n> EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);\n> +EXT4_ATTR(mb_stats_clear, 0200, mb_stats_clear);\n> EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);\n> EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);\n> EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);\n> @@ -301,6 +322,7 @@ static struct attribute *ext4_attrs[] = {\n> \tATTR_LIST(inode_readahead_blks),\n> \tATTR_LIST(inode_goal),\n> \tATTR_LIST(mb_stats),\n> +\tATTR_LIST(mb_stats_clear),\n> \tATTR_LIST(mb_max_to_scan),\n> \tATTR_LIST(mb_min_to_scan),\n> \tATTR_LIST(mb_order2_req),\n> @@ -561,6 +583,8 @@ static ssize_t ext4_attr_store(struct kobject *kobj,\n> \t\treturn trigger_test_error(sbi, buf, len);\n> \tcase attr_err_report_sec:\n> \t\treturn err_report_sec_store(sbi, buf, len);\n> +\tcase attr_mb_stats_clear:\n> +\t\treturn mb_stats_clear_store(sbi, buf, len);\n> \tdefault:\n> \t\treturn ext4_generic_attr_store(a, sbi, buf, len);\n> \t}","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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