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Wed, 11 Jun 2025 23:12:17 -0700 (PDT) From: Jason Xing To: axboe@kernel.dk, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Jason Xing , Yushan Zhou Subject: [PATCH v5 3/5] relayfs: introduce getting relayfs statistics function Date: Thu, 12 Jun 2025 14:11:59 +0800 Message-Id: <20250612061201.34272-4-kerneljasonxing@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20250612061201.34272-1-kerneljasonxing@gmail.com> References: <20250612061201.34272-1-kerneljasonxing@gmail.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Jason Xing 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. Reviewed-by: Yushan Zhou Reviewed-by: Masami Hiramatsu (Google) Signed-off-by: Jason Xing --- include/linux/relay.h | 7 +++++++ kernel/relay.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+) diff --git a/include/linux/relay.h b/include/linux/relay.h index cd77eb285a48..5310967f9d74 100644 --- a/include/linux/relay.h +++ b/include/linux/relay.h @@ -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); diff --git a/kernel/relay.c b/kernel/relay.c index eb3f630f3896..fd70d0e03216 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 -- 2.43.5