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relayfs: introduce getting relayfs statistics function

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In this version, only support getting the counter for buffer full and
implement the framework of how it works.

Users can pass certain flag to fetch what field/statistics they expect to
know.  Each time it only returns one result.  So do not pass multiple
flags.

Link: https://lkml.kernel.org/r/20250612061201.34272-4-kerneljasonxing@gmail.com
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Yushan Zhou <katrinzhou@tencent.com>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jason Xing 2025-06-12 14:11:59 +08:00 committed by Andrew Morton
parent ca01a90ae7
commit a53202ce7f
2 changed files with 37 additions and 0 deletions
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7
include/linux/relay.h
View File

@ -31,6 +31,12 @@
/*
* Relay buffer statistics
*/
enum {
RELAY_STATS_BUF_FULL = (1 << 0),
RELAY_STATS_LAST = RELAY_STATS_BUF_FULL,
};
struct rchan_buf_stats
{
unsigned int full_count; /* counter for buffer full */
@ -167,6 +173,7 @@ struct rchan *relay_open(const char *base_filename,
void *private_data);
extern void relay_close(struct rchan *chan);
extern void relay_flush(struct rchan *chan);
size_t relay_stats(struct rchan *chan, int flags);
extern void relay_subbufs_consumed(struct rchan *chan,
unsigned int cpu,
size_t consumed);

30
kernel/relay.c
View File

@ -700,6 +700,36 @@ void relay_flush(struct rchan *chan)
}
EXPORT_SYMBOL_GPL(relay_flush);
/**
* relay_stats - get channel buffer statistics
* @chan: the channel
* @flags: select particular information to get
*
* Returns the count of certain field that caller specifies.
*/
size_t relay_stats(struct rchan *chan, int flags)
{
unsigned int i, count = 0;
struct rchan_buf *rbuf;
if (!chan || flags > RELAY_STATS_LAST)
return 0;
if (chan->is_global) {
rbuf = *per_cpu_ptr(chan->buf, 0);
if (flags & RELAY_STATS_BUF_FULL)
count = rbuf->stats.full_count;
} else {
for_each_online_cpu(i) {
rbuf = *per_cpu_ptr(chan->buf, i);
if (rbuf && flags & RELAY_STATS_BUF_FULL)
count += rbuf->stats.full_count;
}
}
return count;
}
/**
* relay_file_open - open file op for relay files
* @inode: the inode