diff options
| author |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2018-11-29 20:32:26 -0500 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2018-12-08 20:54:08 -0500 |
| commit | 2c2b0a78b373908926e4683ea5571332f63c0eb5 (patch) | |
| tree | 4ffbcfc1abdc5569e7f444425c86948f1cd2426c /kernel/trace/trace.c | |
| parent | scripts/recordmcount.{c,pl}: support -ffunction-sections .text.* section names (diff) | |
| download | linux-dev-2c2b0a78b373908926e4683ea5571332f63c0eb5.tar.xz linux-dev-2c2b0a78b373908926e4683ea5571332f63c0eb5.zip | |
ring-buffer: Add percentage of ring buffer full to wake up reader
Instead of just waiting for a page to be full before waking up a pending
reader, allow the reader to pass in a "percentage" of pages that have
content before waking up a reader. This should help keep the process of
reading the events not cause wake ups that constantly cause reading of the
buffer.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to '')
| -rw-r--r-- | kernel/trace/trace.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index ff1c4b20cd0a..48d5eb22ff33 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1431,7 +1431,7 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) } #endif /* CONFIG_TRACER_MAX_TRACE */ -static int wait_on_pipe(struct trace_iterator *iter, bool full) +static int wait_on_pipe(struct trace_iterator *iter, int full) { /* Iterators are static, they should be filled or empty */ if (trace_buffer_iter(iter, iter->cpu_file)) @@ -5693,7 +5693,7 @@ static int tracing_wait_pipe(struct file *filp) mutex_unlock(&iter->mutex); - ret = wait_on_pipe(iter, false); + ret = wait_on_pipe(iter, 0); mutex_lock(&iter->mutex); @@ -6751,7 +6751,7 @@ tracing_buffers_read(struct file *filp, char __user *ubuf, if ((filp->f_flags & O_NONBLOCK)) return -EAGAIN; - ret = wait_on_pipe(iter, false); + ret = wait_on_pipe(iter, 0); if (ret) return ret; @@ -6948,7 +6948,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos, if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK)) goto out; - ret = wait_on_pipe(iter, true); + ret = wait_on_pipe(iter, 1); if (ret) goto out; |