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author | Kevin Hao <haokexin@gmail.com> | 2019-11-06 08:16:57 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-11-06 19:47:50 +0300 |
commit | 5cbf2fff3bba8d3c6a4d47c1754de1cf57e2b01f (patch) | |
tree | 25bc30bf2caa8885f914a052558a8b2b62257ab4 /mm/slab.h | |
parent | a31631302abce4c80913d4dc741c4a6b07969b0e (diff) | |
download | linux-5cbf2fff3bba8d3c6a4d47c1754de1cf57e2b01f.tar.xz |
dump_stack: avoid the livelock of the dump_lock
In the current code, we use the atomic_cmpxchg() to serialize the output
of the dump_stack(), but this implementation suffers the thundering herd
problem. We have observed such kind of livelock on a Marvell cn96xx
board(24 cpus) when heavily using the dump_stack() in a kprobe handler.
Actually we can let the competitors to wait for the releasing of the
lock before jumping to atomic_cmpxchg(). This will definitely mitigate
the thundering herd problem. Thanks Linus for the suggestion.
[akpm@linux-foundation.org: fix comment]
Link: http://lkml.kernel.org/r/20191030031637.6025-1-haokexin@gmail.com
Fixes: b58d977432c8 ("dump_stack: serialize the output from dump_stack()")
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slab.h')
0 files changed, 0 insertions, 0 deletions