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fs: tracepoints around multigrain timestamp events

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Add some tracepoints around various multigrain timestamp events.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org> # documentation bits
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20241002-mgtime-v10-6-d1c4717f5284@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Jeff Layton
2024-10-02 17:27:21 -04:00
committed by Christian Brauner
parent 7f2c86cba3
commit c86e3c4718
3 changed files with 135 additions and 1 deletions
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9
fs/inode.c
View File

@@ -22,6 +22,9 @@
#include <linux/iversion.h>
#include <linux/rw_hint.h>
#include <trace/events/writeback.h>
#define CREATE_TRACE_POINTS
#include <trace/events/timestamp.h>
#include "internal.h"
/*
@@ -2603,6 +2606,7 @@ EXPORT_SYMBOL(inode_nohighmem);
struct timespec64 inode_set_ctime_to_ts(struct inode *inode, struct timespec64 ts)
{
trace_inode_set_ctime_to_ts(inode, &ts);
set_normalized_timespec64(&ts, ts.tv_sec, ts.tv_nsec);
inode->i_ctime_sec = ts.tv_sec;
inode->i_ctime_nsec = ts.tv_nsec;
@@ -2689,14 +2693,17 @@ struct timespec64 inode_set_ctime_current(struct inode *inode)
}
/* No need to cmpxchg if it's exactly the same */
if (cns == now.tv_nsec && inode->i_ctime_sec == now.tv_sec)
if (cns == now.tv_nsec && inode->i_ctime_sec == now.tv_sec) {
trace_ctime_xchg_skip(inode, &now);
goto out;
}
cur = cns;
retry:
/* Try to swap the nsec value into place. */
if (try_cmpxchg(&inode->i_ctime_nsec, &cur, now.tv_nsec)) {
/* If swap occurred, then we're (mostly) done */
inode->i_ctime_sec = now.tv_sec;
trace_ctime_ns_xchg(inode, cns, now.tv_nsec, cur);
} else {
/*
* Was the change due to someone marking the old ctime QUERIED?

3
fs/stat.c
View File

@@ -23,6 +23,8 @@
#include <linux/uaccess.h>
#include <asm/unistd.h>
#include <trace/events/timestamp.h>
#include "internal.h"
#include "mount.h"
@@ -56,6 +58,7 @@ void fill_mg_cmtime(struct kstat *stat, u32 request_mask, struct inode *inode)
if (!(stat->ctime.tv_nsec & I_CTIME_QUERIED))
stat->ctime.tv_nsec = ((u32)atomic_fetch_or(I_CTIME_QUERIED, pcn));
stat->ctime.tv_nsec &= ~I_CTIME_QUERIED;
trace_fill_mg_cmtime(inode, &stat->ctime, &stat->mtime);
}
EXPORT_SYMBOL(fill_mg_cmtime);

124
include/trace/events/timestamp.h Normal file
View File

@@ -0,0 +1,124 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM timestamp
#if !defined(_TRACE_TIMESTAMP_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_TIMESTAMP_H
#include <linux/tracepoint.h>
#include <linux/fs.h>
#define CTIME_QUERIED_FLAGS \
{ I_CTIME_QUERIED, "Q" }
DECLARE_EVENT_CLASS(ctime,
TP_PROTO(struct inode *inode,
struct timespec64 *ctime),
TP_ARGS(inode, ctime),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(ino_t, ino)
__field(time64_t, ctime_s)
__field(u32, ctime_ns)
__field(u32, gen)
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->gen = inode->i_generation;
__entry->ctime_s = ctime->tv_sec;
__entry->ctime_ns = ctime->tv_nsec;
),
TP_printk("ino=%d:%d:%ld:%u ctime=%lld.%u",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->ino, __entry->gen,
__entry->ctime_s, __entry->ctime_ns
)
);
DEFINE_EVENT(ctime, inode_set_ctime_to_ts,
TP_PROTO(struct inode *inode,
struct timespec64 *ctime),
TP_ARGS(inode, ctime));
DEFINE_EVENT(ctime, ctime_xchg_skip,
TP_PROTO(struct inode *inode,
struct timespec64 *ctime),
TP_ARGS(inode, ctime));
TRACE_EVENT(ctime_ns_xchg,
TP_PROTO(struct inode *inode,
u32 old,
u32 new,
u32 cur),
TP_ARGS(inode, old, new, cur),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(ino_t, ino)
__field(u32, gen)
__field(u32, old)
__field(u32, new)
__field(u32, cur)
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->gen = inode->i_generation;
__entry->old = old;
__entry->new = new;
__entry->cur = cur;
),
TP_printk("ino=%d:%d:%ld:%u old=%u:%s new=%u cur=%u:%s",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->ino, __entry->gen,
__entry->old & ~I_CTIME_QUERIED,
__print_flags(__entry->old & I_CTIME_QUERIED, "|", CTIME_QUERIED_FLAGS),
__entry->new,
__entry->cur & ~I_CTIME_QUERIED,
__print_flags(__entry->cur & I_CTIME_QUERIED, "|", CTIME_QUERIED_FLAGS)
)
);
TRACE_EVENT(fill_mg_cmtime,
TP_PROTO(struct inode *inode,
struct timespec64 *ctime,
struct timespec64 *mtime),
TP_ARGS(inode, ctime, mtime),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(ino_t, ino)
__field(time64_t, ctime_s)
__field(time64_t, mtime_s)
__field(u32, ctime_ns)
__field(u32, mtime_ns)
__field(u32, gen)
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->gen = inode->i_generation;
__entry->ctime_s = ctime->tv_sec;
__entry->mtime_s = mtime->tv_sec;
__entry->ctime_ns = ctime->tv_nsec;
__entry->mtime_ns = mtime->tv_nsec;
),
TP_printk("ino=%d:%d:%ld:%u ctime=%lld.%u mtime=%lld.%u",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->ino, __entry->gen,
__entry->ctime_s, __entry->ctime_ns,
__entry->mtime_s, __entry->mtime_ns
)
);
#endif /* _TRACE_TIMESTAMP_H */
/* This part must be outside protection */
#include <trace/define_trace.h>