linux-ext4 - Re: [PATCH v3 2/9] fs: tracepoints around multigrain timestamp events

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Message-ID: <20240705140703.711d816b@rorschach.local.home>
Date: Fri, 5 Jul 2024 14:07:03 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Jeff Layton <jlayton@...nel.org>
Cc: Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner
 <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 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>, Dave Chinner <david@...morbit.com>, Andi Kleen
 <ak@...ux.intel.com>, Christoph Hellwig <hch@...radead.org>,
 kernel-team@...com, 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
Subject: Re: [PATCH v3 2/9] fs: tracepoints around multigrain timestamp
 events

On Fri, 05 Jul 2024 13:02:36 -0400
Jeff Layton <jlayton@...nel.org> wrote:

> diff --git a/include/trace/events/timestamp.h b/include/trace/events/timestamp.h
> new file mode 100644
> index 000000000000..a004e5572673
> --- /dev/null
> +++ b/include/trace/events/timestamp.h
> @@ -0,0 +1,109 @@
> +/* 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>
> +
> +TRACE_EVENT(inode_set_ctime_to_ts,
> +	TP_PROTO(struct inode *inode,
> +		 struct timespec64 *ctime),
> +
> +	TP_ARGS(inode, ctime),
> +
> +	TP_STRUCT__entry(
> +		__field(dev_t,			dev)
> +		__field(ino_t,			ino)
> +		__field(u32,			gen)

It's best to keep the above 4 byte word below 8 byte words, otherwise,
it will likely create a 4 byte hole in between.

> +		__field(time64_t,		ctime_s)
> +		__field(u32,			ctime_ns)
> +	),
> +
> +	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
> +	)
> +);
> +
> +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:%c new=%u cur=%u:%c",
> +		MAJOR(__entry->dev), MINOR(__entry->dev), __entry->ino, __entry->gen,
> +		__entry->old & ~I_CTIME_QUERIED, __entry->old & I_CTIME_QUERIED ? 'Q' : '-',
> +		__entry->new,
> +		__entry->cur & ~I_CTIME_QUERIED, __entry->cur & I_CTIME_QUERIED ? 'Q' : '-'
> +	)
> +);
> +
> +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(u32,			gen)

Same here.

-- Steve

> +		__field(time64_t,		ctime_s)
> +		__field(time64_t,		mtime_s)
> +		__field(u32,			ctime_ns)
> +		__field(u32,			mtime_ns)
> +	),
> +
> +	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>
>