diff options
| author | Jason Xing <kernelxing@tencent.com> | 2025-06-12 14:11:59 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-07-09 22:57:51 -0700 |
| commit | a53202ce7fbafd24f854865b02eff891e246c550 (patch) | |
| tree | 5e9ff87c1286c4542387937e8c8db3fcff783381 /kernel/relay.c | |
| parent | ca01a90ae7bf9bb22137e719366bdc0f387675c2 (diff) | |
relayfs: introduce getting relayfs statistics function
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>
Diffstat (limited to 'kernel/relay.c')
| -rw-r--r-- | kernel/relay.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/kernel/relay.c b/kernel/relay.c index 4b07efddc2cf..2fc27c0e771e 100644 --- a/kernel/relay.c +++ b/kernel/relay.c @@ -701,6 +701,36 @@ 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 * @filp: the file |