{"id":2223063,"url":"http://patchwork.ozlabs.org/api/1.0/patches/2223063/?format=json","project":{"id":8,"url":"http://patchwork.ozlabs.org/api/1.0/projects/8/?format=json","name":"Linux ext4 filesystem development","link_name":"linux-ext4","list_id":"linux-ext4.vger.kernel.org","list_email":"linux-ext4@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20260414100212.95209-1-liubaolin12138@163.com>","date":"2026-04-14T10:02:11","name":"[v1] ext4: add mb_stats_clear for mballoc statistics","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"314b46f89b00508b0b33ebf300f9ebee7334543e","submitter":{"id":89479,"url":"http://patchwork.ozlabs.org/api/1.0/people/89479/?format=json","name":"liubaolin","email":"liubaolin12138@163.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260414100212.95209-1-liubaolin12138@163.com/mbox/","series":[{"id":499811,"url":"http://patchwork.ozlabs.org/api/1.0/series/499811/?format=json","date":"2026-04-14T10:02:11","name":"[v1] ext4: add mb_stats_clear for mballoc statistics","version":1,"mbox":"http://patchwork.ozlabs.org/series/499811/mbox/"}],"check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2223063/checks/","tags":{},"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=Lns44EO5;\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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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=From:To:Subject:Date:Message-ID:MIME-Version; bh=yy\n\ty/TZVRqdIC6eQ1z8Fb/qwWijS+XhBLAucbRi6wwV4=; b=Lns44EO5FOJ7Uulitn\n\t2/Aa6ykIAlx1lGkGNR+mSPuXT75M0n2V5OrEIf001jz9/9wa+m0fNdxjYnJ5nGht\n\tCZ0IVGg92EJBInAr/H+hmDAye77q00+Ru6x5MyBSsXcuNyX3ITpPURlmXFNfpRZg\n\tUm2Sue3E+kAfii2K2kwMlEIJE=","From":"Baolin Liu ","To":"tytso@mit.edu,\n\tadilger.kernel@dilger.ca","Cc":"liubaolin12138@163.com,\n\tlinux-ext4@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\twangguanyu@vivo.com,\n\tBaolin Liu ","Subject":"[PATCH v1] ext4: add mb_stats_clear for mballoc statistics","Date":"Tue, 14 Apr 2026 18:02:11 +0800","Message-ID":"<20260414100212.95209-1-liubaolin12138@163.com>","X-Mailer":"git-send-email 2.51.0","Precedence":"bulk","X-Mailing-List":"linux-ext4@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-CM-TRANSID":"_____wBHq46oEN5pKQJTFA--.6735S2","X-Coremail-Antispam":"1Uf129KBjvJXoW3ArWrZrWDGFW7Xr13XFy3twb_yoW7Gw13pF\n\tsxXa4UCr4UZ3Wxurs3Ww4fW3ZYk3y0kryUGrWayw1S9FWavrySyF9aqFy0vFy5ArW8Aa4k\n\tX3Wqv3yDGrZYg37anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0pEo7KnUUUUU=","X-CM-SenderInfo":"xolxutxrol0iasrtmqqrwthudrp/xtbCwgtAC2neEKsd2gAA3J","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,UNPARSEABLE_RELAY\n\tautolearn=disabled version=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"},"content":"From: Baolin Liu \n\nAdd a write-only mb_stats_clear sysfs knob to reset ext4 mballoc\nruntime statistics.This makes it easier to inspect allocator\nactivity for a specific workload instead of using counters\naccumulated since mount.\n\nSigned-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(+)","diff":"diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h\nindex 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 *,\ndiff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c\nindex 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\ndiff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c\nindex 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}\n","prefixes":["v1"]}