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| author | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-12-28 16:52:04 -0500 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-12-28 19:17:54 -0500 |
| commit | e34cbd83f6d3c63cd0194aae45b206049c42cb54 (patch) | |
| tree | d3d856a4160b22b2492444383a3eaee1429d23f4 | |
| parent | 1f50965bff79554400e74372983d93af1105971a (diff) | |
| download | libtracefs-e34cbd83f6d3c63cd0194aae45b206049c42cb54.tar.gz | |
libtracefs: Increase splice to use pipe max size
When a pipe is created for splicing to read the tracing ring buffer, instead
of using the default size, which is usually around 65K, read
/proc/sys/fs/pipe_max_size and try to set the pipe to use that size instead.
Link: https://lore.kernel.org/linux-trace-devel/20231228215433.54854-10-rostedt@goodmis.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
| -rw-r--r-- | src/tracefs-record.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/tracefs-record.c b/src/tracefs-record.c index b078c86..8750fe7 100644 --- a/src/tracefs-record.c +++ b/src/tracefs-record.c @@ -319,6 +319,7 @@ int tracefs_cpu_read(struct tracefs_cpu *tcpu, void *buffer, bool nonblock) static int init_splice(struct tracefs_cpu *tcpu) { + char *buf; int ret; if (tcpu->splice_pipe[0] >= 0) @@ -328,6 +329,12 @@ static int init_splice(struct tracefs_cpu *tcpu) if (ret < 0) return ret; + if (str_read_file("/proc/sys/fs/pipe-max-size", &buf, false)) { + int size = atoi(buf); + fcntl(tcpu->splice_pipe[0], F_SETPIPE_SZ, &size); + free(buf); + } + ret = fcntl(tcpu->splice_pipe[0], F_GETPIPE_SZ, &tcpu->pipe_size); /* * F_GETPIPE_SZ was introduced in 2.6.35, ftrace was introduced |