From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>
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.
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
---
src/tracefs-record.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/tracefs-record.c b/src/tracefs-record.c
index b078c8615194..8750fe7e0e29 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
--
2.42.0
|