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Message-Id: <20250314030036.2543180-1-chen.dylane@linux.dev>
Date: Fri, 14 Mar 2025 11:00:36 +0800
From: Tao Chen <chen.dylane@...ux.dev>
To: peterz@...radead.org,
mingo@...hat.com,
acme@...nel.org,
namhyung@...nel.org,
mark.rutland@....com,
alexander.shishkin@...ux.intel.com,
jolsa@...nel.org,
irogers@...gle.com,
adrian.hunter@...el.com,
kan.liang@...ux.intel.com,
fweisbec@...il.com
Cc: linux-perf-users@...r.kernel.org,
linux-kernel@...r.kernel.org,
Tao Chen <chen.dylane@...ux.dev>
Subject: [PATCH linux-next v2] perf/ring_buffer: Add EPOLLRDNORM flag for poll
The poll man page says POLLRDNORM is equivalent to POLLIN. For poll,
it seems that if user sets pollfd with POLLRDNORM in userspace, perf_poll
will not return until timeout even if perf_output_wakeup called, whereas POLLIN
returns.
Fixes: 76369139ceb9 ("perf: Split up buffer handling from core code")
Signed-off-by: Tao Chen <chen.dylane@...ux.dev>
---
kernel/events/ring_buffer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Change list:
- v1 -> v2:
- add changelog
- v1
https://lore.kernel.org/all/20250313051047.2436098-1-chen.dylane@linux.dev
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index 59a52b1a1..5130b119d 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -19,7 +19,7 @@
static void perf_output_wakeup(struct perf_output_handle *handle)
{
- atomic_set(&handle->rb->poll, EPOLLIN);
+ atomic_set(&handle->rb->poll, EPOLLIN | EPOLLRDNORM);
handle->event->pending_wakeup = 1;
--
2.43.0
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