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Message-Id: <20240715-mgtime-v6-2-48e5d34bd2ba@kernel.org>
Date: Mon, 15 Jul 2024 08:48:53 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Chandan Babu R <chandan.babu@...cle.com>,
"Darrick J. Wong" <djwong@...nel.org>, Theodore Ts'o <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>, Chris Mason <clm@...com>,
Josef Bacik <josef@...icpanda.com>, David Sterba <dsterba@...e.com>,
Hugh Dickins <hughd@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>,
Jonathan Corbet <corbet@....net>
Cc: Dave Chinner <david@...morbit.com>, Andi Kleen <ak@...ux.intel.com>,
Christoph Hellwig <hch@...radead.org>, Uros Bizjak <ubizjak@...il.com>,
Kent Overstreet <kent.overstreet@...ux.dev>, Arnd Bergmann <arnd@...db.de>,
Randy Dunlap <rdunlap@...radead.org>, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
linux-xfs@...r.kernel.org, linux-ext4@...r.kernel.org,
linux-btrfs@...r.kernel.org, linux-mm@...ck.org, linux-nfs@...r.kernel.org,
linux-doc@...r.kernel.org, Jeff Layton <jlayton@...nel.org>
Subject: [PATCH v6 2/9] fs: tracepoints around multigrain timestamp events
Add some tracepoints around various multigrain timestamp events.
Reviewed-by: Josef Bacik <josef@...icpanda.com>
Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
fs/inode.c | 9 ++-
fs/stat.c | 3 +
include/trace/events/timestamp.h | 124 +++++++++++++++++++++++++++++++++++++++
3 files changed, 135 insertions(+), 1 deletion(-)
diff --git a/fs/inode.c b/fs/inode.c
index 417acbeabef3..869994285e87 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -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"
/*
@@ -2569,6 +2572,7 @@ 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;
@@ -2668,13 +2672,16 @@ struct timespec64 inode_set_ctime_current(struct inode *inode)
cur = cns;
/* No need to cmpxchg if it's exactly the same */
- if (cns == now_ts.tv_nsec && inode->i_ctime_sec == now_ts.tv_sec)
+ if (cns == now_ts.tv_nsec && inode->i_ctime_sec == now_ts.tv_sec) {
+ trace_ctime_xchg_skip(inode, &now_ts);
goto out;
+ }
retry:
/* Try to swap the nsec value into place. */
if (try_cmpxchg(&inode->i_ctime_nsec, &cur, now_ts.tv_nsec)) {
/* If swap occurred, then we're (mostly) done */
inode->i_ctime_sec = now_ts.tv_sec;
+ trace_ctime_ns_xchg(inode, cns, now_ts.tv_nsec, cur);
} else {
/*
* Was the change due to someone marking the old ctime QUERIED?
diff --git a/fs/stat.c b/fs/stat.c
index df7fdd3afed9..552dfd67688b 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -23,6 +23,8 @@
#include <linux/uaccess.h>
#include <asm/unistd.h>
+#include <trace/events/timestamp.h>
+
#include "internal.h"
#include "mount.h"
@@ -49,6 +51,7 @@ void fill_mg_cmtime(struct kstat *stat, u32 request_mask, struct inode *inode)
stat->mtime = inode_get_mtime(inode);
stat->ctime.tv_sec = inode->i_ctime_sec;
stat->ctime.tv_nsec = ((u32)atomic_fetch_or(I_CTIME_QUERIED, pcn)) & ~I_CTIME_QUERIED;
+ trace_fill_mg_cmtime(inode, &stat->ctime, &stat->mtime);
}
EXPORT_SYMBOL(fill_mg_cmtime);
diff --git a/include/trace/events/timestamp.h b/include/trace/events/timestamp.h
new file mode 100644
index 000000000000..c9e5ec930054
--- /dev/null
+++ b/include/trace/events/timestamp.h
@@ -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>
--
2.45.2
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