Commit dcb10a96 authored by Alexander Shishkin's avatar Alexander Shishkin Committed by Ingo Molnar

perf/ring_buffer: Refuse to begin AUX transaction after rb->aux_mmap_count drops

When ring buffer's AUX area is unmapped and rb->aux_mmap_count drops to
zero, new AUX transactions into this buffer can still be started,
even though the buffer in en route to deallocation.

This patch adds a check to perf_aux_output_begin() for rb->aux_mmap_count
being zero, in which case there is no point starting new transactions,
in other words, the ring buffers that pass a certain point in
perf_mmap_close will not have their events sending new data, which
clears path for freeing those buffers' pages right there and then,
provided that no active transactions are holding the AUX reference.
Signed-off-by: default avatarAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: vince@deater.net
Link: http://lkml.kernel.org/r/1457098969-21595-2-git-send-email-alexander.shishkin@linux.intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 26657848
...@@ -287,6 +287,13 @@ void *perf_aux_output_begin(struct perf_output_handle *handle, ...@@ -287,6 +287,13 @@ void *perf_aux_output_begin(struct perf_output_handle *handle,
if (!rb_has_aux(rb) || !atomic_inc_not_zero(&rb->aux_refcount)) if (!rb_has_aux(rb) || !atomic_inc_not_zero(&rb->aux_refcount))
goto err; goto err;
/*
* If rb::aux_mmap_count is zero (and rb_has_aux() above went through),
* the aux buffer is in perf_mmap_close(), about to get freed.
*/
if (!atomic_read(&rb->aux_mmap_count))
goto err;
/* /*
* Nesting is not supported for AUX area, make sure nested * Nesting is not supported for AUX area, make sure nested
* writers are caught early * writers are caught early
......
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