[{"id":3641117,"web_url":"http://patchwork.ozlabs.org/comment/3641117/","msgid":"<20260123125737.2b6ddbbe@gandalf.local.home>","list_archive_url":null,"date":"2026-01-23T17:57:37","subject":"Re: [RFC v4 6/7] ext4: fast commit: add lock_updates tracepoint","submitter":{"id":112,"url":"http://patchwork.ozlabs.org/api/people/112/","name":"Steven Rostedt","email":"rostedt@goodmis.org"},"content":"On Tue, 20 Jan 2026 19:25:35 +0800\nLi Chen wrote:\n\n> Commit-time fast commit snapshots run under jbd2_journal_lock_updates(),\n> so it is useful to quantify the time spent with updates locked and to\n> understand why snapshotting can fail.\n> \n> Add a new tracepoint, ext4_fc_lock_updates, reporting the time spent in\n> the updates-locked window along with the number of snapshotted inodes\n> and ranges. Record the first snapshot failure reason in a stable snap_err\n> field for tooling.\n> \n> Signed-off-by: Li Chen \n> ---\n> fs/ext4/fast_commit.c | 86 ++++++++++++++++++++++++++++++-------\n> include/trace/events/ext4.h | 33 ++++++++++++++\n> 2 files changed, 104 insertions(+), 15 deletions(-)\n> \n> diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c\n> index d1eefee60912..d266eb2a4219 100644\n> --- a/fs/ext4/fast_commit.c\n> +++ b/fs/ext4/fast_commit.c\n> @@ -193,6 +193,27 @@ static struct kmem_cache *ext4_fc_range_cachep;\n> #define EXT4_FC_SNAPSHOT_MAX_INODES\t1024\n> #define EXT4_FC_SNAPSHOT_MAX_RANGES\t2048\n> \n> +/*\n> + * Snapshot failure reasons for ext4_fc_lock_updates tracepoint.\n> + * Keep these stable for tooling.\n> + */\n> +enum ext4_fc_snap_err {\n> +\tEXT4_FC_SNAP_ERR_NONE = 0,\n> +\tEXT4_FC_SNAP_ERR_ES_MISS,\n> +\tEXT4_FC_SNAP_ERR_ES_DELAYED,\n> +\tEXT4_FC_SNAP_ERR_ES_OTHER,\n> +\tEXT4_FC_SNAP_ERR_INODES_CAP,\n> +\tEXT4_FC_SNAP_ERR_RANGES_CAP,\n> +\tEXT4_FC_SNAP_ERR_NOMEM,\n> +\tEXT4_FC_SNAP_ERR_INODE_LOC,\n> +};\n> +\n> +static inline void ext4_fc_set_snap_err(int *snap_err, int err)\n> +{\n> +\tif (snap_err && *snap_err == EXT4_FC_SNAP_ERR_NONE)\n> +\t\t*snap_err = err;\n> +}\n> +\n\n\n\n> diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h\n> index fd76d14c2776..a1493971821d 100644\n> --- a/include/trace/events/ext4.h\n> +++ b/include/trace/events/ext4.h\n> @@ -2812,6 +2812,39 @@ TRACE_EVENT(ext4_fc_commit_stop,\n> \t\t __entry->num_fc_ineligible, __entry->nblks_agg, __entry->tid)\n> );\n> \n\nWhy not make the snap_err into a human readable format?\n\n#define TRACE_SNAP_ERR\t\t\\\n\tEM(NONE)\t\t\\\n\tEM(ES_MISS)\t\t\\\n\tEM(ES_DELAYED)\t\t\\\n\tEM(ES_OTHER)\t\t\\\n\tEM(INODES_CAP)\t\t\\\n\tEM(RANGES_CAP)\t\t\\\n\tEM(NOMEM)\t\t\\\n\tEMe(INODE_LOC)\t\t\\\n\n#undef EM\n#undef EMe\n\n#define EM(a)\tTRACE_DEFINE_ENUM(EXT4_FC_SNAP_ERR_##a);\n#define EMe(a)\tTRACE_DEFINE_ENUM(EXT4_FC_SNAP_ERR_##a);\n\nTRACE_SNAP_ERR\n\n#undef EM\n#undef EMe\n\n#define EM(a)\t{ EXT4_FC_SNAP_ERR_##a, #a },\n#define EM(a)\t{ EXT4_FC_SNAP_ERR_##a, #a }\n\n\n> +TRACE_EVENT(ext4_fc_lock_updates,\n> +\t TP_PROTO(struct super_block *sb, tid_t commit_tid, u64 locked_ns,\n> +\t\t unsigned int nr_inodes, unsigned int nr_ranges, int err,\n> +\t\t int snap_err),\n> +\n> +\tTP_ARGS(sb, commit_tid, locked_ns, nr_inodes, nr_ranges, err, snap_err),\n> +\n> +\tTP_STRUCT__entry(/* entry */\n> +\t\t__field(dev_t, dev)\n> +\t\t__field(tid_t, tid)\n> +\t\t__field(u64, locked_ns)\n> +\t\t__field(unsigned int, nr_inodes)\n> +\t\t__field(unsigned int, nr_ranges)\n> +\t\t__field(int, err)\n> +\t\t__field(int, snap_err)\n> +\t),\n> +\n> +\tTP_fast_assign(/* assign */\n> +\t\t__entry->dev = sb->s_dev;\n> +\t\t__entry->tid = commit_tid;\n> +\t\t__entry->locked_ns = locked_ns;\n> +\t\t__entry->nr_inodes = nr_inodes;\n> +\t\t__entry->nr_ranges = nr_ranges;\n> +\t\t__entry->err = err;\n> +\t\t__entry->snap_err = snap_err;\n> +\t),\n> +\n> +\tTP_printk(\"dev %d,%d tid %u locked_ns %llu nr_inodes %u nr_ranges %u err %d snap_err %d\",\n> +\t\t MAJOR(__entry->dev), MINOR(__entry->dev), __entry->tid,\n> +\t\t __entry->locked_ns, __entry->nr_inodes, __entry->nr_ranges,\n> +\t\t __entry->err, __entry->snap_err)\n\nAnd instead of having the raw value of __entry->snap_err, use:\n\n\t\t__entry->err, __print_symbolic(__entry->snap_err, TRACE_SNAP_ERR))\n\n-- Steve\n\n\n> +);\n> +\n> #define FC_REASON_NAME_STAT(reason)\t\t\t\t\t\\\n> \tshow_fc_reason(reason),\t\t\t\t\t\t\\\n> \t__entry->fc_ineligible_rc[reason]\n\n1","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=150.107.74.76; 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x86_64-pc-linux-gnu)","Precedence":"bulk","X-Mailing-List":"linux-ext4@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain; charset=US-ASCII","Content-Transfer-Encoding":"7bit","X-Rspamd-Queue-Id":"D940920024","X-Stat-Signature":"5cfcpomb4bsdhw65j6p7jyceep8ki3oe","X-Rspamd-Server":"rspamout05","X-Session-Marker":"726F737465647440676F6F646D69732E6F7267","X-Session-ID":"U2FsdGVkX18ayUQTicwAkS19YmBMQjsoWLi9S4LSZbM=","X-HE-Tag":"1769191028-289448","X-HE-Meta":"\n U2FsdGVkX18itwA3BKwJlBEvi7szA+ksv6rm9NUwPu/bfijaonP9EG+vaXbUVIXknmiNkJfv7pQwpqC/XM9UwwY9lcXu3qgum5zj5LeL1mbHMaWD2eX8t1r5uWLyWgMOduLC0zptT1ezNzx8y32jslJZ9MX3IV7ZZk4xBdkPyIjdbET6KzCLiH6S0O2jbBkH5drxKnanh6Ou79hNJxRgbBAkqQOHH7HLeIOx4XDbZddKY+aqrvzPsM0z5K+9vNWuSB+TZ7zoKEtGicmz9PbvOM7OUciy8gM/YImsLvrmxMTC1lJdklb9DcsmKb+8ACcU","X-Spam-Status":"No, score=-0.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDMARC_NONE,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,\n\tSPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY autolearn=disabled\n\tversion=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"}},{"id":3642137,"web_url":"http://patchwork.ozlabs.org/comment/3642137/","msgid":"<19bff57d732.675dda83304172.1851572061101730667@linux.beauty>","list_archive_url":null,"date":"2026-01-27T12:05:05","subject":"Re: [RFC v4 6/7] ext4: fast commit: add lock_updates tracepoint","submitter":{"id":84264,"url":"http://patchwork.ozlabs.org/api/people/84264/","name":"Li Chen","email":"me@linux.beauty"},"content":"Hi Steven,\n\n > On Tue, 20 Jan 2026 19:25:35 +0800\n > Li Chen wrote:\n > \n > > Commit-time fast commit snapshots run under jbd2_journal_lock_updates(),\n > > so it is useful to quantify the time spent with updates locked and to\n > > understand why snapshotting can fail.\n > > \n > > Add a new tracepoint, ext4_fc_lock_updates, reporting the time spent in\n > > the updates-locked window along with the number of snapshotted inodes\n > > and ranges. Record the first snapshot failure reason in a stable snap_err\n > > field for tooling.\n > > \n > > Signed-off-by: Li Chen \n > > ---\n > > fs/ext4/fast_commit.c | 86 ++++++++++++++++++++++++++++++-------\n > > include/trace/events/ext4.h | 33 ++++++++++++++\n > > 2 files changed, 104 insertions(+), 15 deletions(-)\n > > \n > > diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c\n > > index d1eefee60912..d266eb2a4219 100644\n > > --- a/fs/ext4/fast_commit.c\n > > +++ b/fs/ext4/fast_commit.c\n > > @@ -193,6 +193,27 @@ static struct kmem_cache *ext4_fc_range_cachep;\n > > #define EXT4_FC_SNAPSHOT_MAX_INODES 1024\n > > #define EXT4_FC_SNAPSHOT_MAX_RANGES 2048\n > > \n > > +/*\n > > + * Snapshot failure reasons for ext4_fc_lock_updates tracepoint.\n > > + * Keep these stable for tooling.\n > > + */\n > > +enum ext4_fc_snap_err {\n > > + EXT4_FC_SNAP_ERR_NONE = 0,\n > > + EXT4_FC_SNAP_ERR_ES_MISS,\n > > + EXT4_FC_SNAP_ERR_ES_DELAYED,\n > > + EXT4_FC_SNAP_ERR_ES_OTHER,\n > > + EXT4_FC_SNAP_ERR_INODES_CAP,\n > > + EXT4_FC_SNAP_ERR_RANGES_CAP,\n > > + EXT4_FC_SNAP_ERR_NOMEM,\n > > + EXT4_FC_SNAP_ERR_INODE_LOC,\n > > +};\n > > +\n > > +static inline void ext4_fc_set_snap_err(int *snap_err, int err)\n > > +{\n > > + if (snap_err && *snap_err == EXT4_FC_SNAP_ERR_NONE)\n > > + *snap_err = err;\n > > +}\n > > +\n > \n > \n > \n > > diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h\n > > index fd76d14c2776..a1493971821d 100644\n > > --- a/include/trace/events/ext4.h\n > > +++ b/include/trace/events/ext4.h\n > > @@ -2812,6 +2812,39 @@ TRACE_EVENT(ext4_fc_commit_stop,\n > > __entry->num_fc_ineligible, __entry->nblks_agg, __entry->tid)\n > > );\n > > \n > \n > Why not make the snap_err into a human readable format?\n > \n > #define TRACE_SNAP_ERR \\\n > EM(NONE) \\\n > EM(ES_MISS) \\\n > EM(ES_DELAYED) \\\n > EM(ES_OTHER) \\\n > EM(INODES_CAP) \\\n > EM(RANGES_CAP) \\\n > EM(NOMEM) \\\n > EMe(INODE_LOC) \\\n > \n > #undef EM\n > #undef EMe\n > \n > #define EM(a) TRACE_DEFINE_ENUM(EXT4_FC_SNAP_ERR_##a);\n > #define EMe(a) TRACE_DEFINE_ENUM(EXT4_FC_SNAP_ERR_##a);\n > \n > TRACE_SNAP_ERR\n > \n > #undef EM\n > #undef EMe\n > \n > #define EM(a) { EXT4_FC_SNAP_ERR_##a, #a },\n > #define EM(a) { EXT4_FC_SNAP_ERR_##a, #a }\n > \n > \n > > +TRACE_EVENT(ext4_fc_lock_updates,\n > > + TP_PROTO(struct super_block *sb, tid_t commit_tid, u64 locked_ns,\n > > + unsigned int nr_inodes, unsigned int nr_ranges, int err,\n > > + int snap_err),\n > > +\n > > + TP_ARGS(sb, commit_tid, locked_ns, nr_inodes, nr_ranges, err, snap_err),\n > > +\n > > + TP_STRUCT__entry(/* entry */\n > > + __field(dev_t, dev)\n > > + __field(tid_t, tid)\n > > + __field(u64, locked_ns)\n > > + __field(unsigned int, nr_inodes)\n > > + __field(unsigned int, nr_ranges)\n > > + __field(int, err)\n > > + __field(int, snap_err)\n > > + ),\n > > +\n > > + TP_fast_assign(/* assign */\n > > + __entry->dev = sb->s_dev;\n > > + __entry->tid = commit_tid;\n > > + __entry->locked_ns = locked_ns;\n > > + __entry->nr_inodes = nr_inodes;\n > > + __entry->nr_ranges = nr_ranges;\n > > + __entry->err = err;\n > > + __entry->snap_err = snap_err;\n > > + ),\n > > +\n > > + TP_printk(\"dev %d,%d tid %u locked_ns %llu nr_inodes %u nr_ranges %u err %d snap_err %d\",\n > > + MAJOR(__entry->dev), MINOR(__entry->dev), __entry->tid,\n > > + __entry->locked_ns, __entry->nr_inodes, __entry->nr_ranges,\n > > + __entry->err, __entry->snap_err)\n > \n > And instead of having the raw value of __entry->snap_err, use:\n > \n > __entry->err, __print_symbolic(__entry->snap_err, TRACE_SNAP_ERR))\n\nGood point. I'll switch snap_err to __print_symbolic() in v5.\n\nRegards,\nLi​","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=linux.beauty header.i=me@linux.beauty\n header.a=rsa-sha256 header.s=zmail header.b=cK2AEMYX;\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=jv8l=aa=vger.kernel.org=linux-ext4+bounces-13352-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:zohomail.com\"","gandalf.ozlabs.org;\n dmarc=none (p=none dis=none) header.from=linux.beauty","gandalf.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=linux.beauty header.i=me@linux.beauty\n header.a=rsa-sha256 header.s=zmail header.b=cK2AEMYX;\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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