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| author | Wei Fang <fangwei1@huawei.com> | 2016-07-06 11:32:20 +0800 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-07-24 16:37:16 -0400 |
| commit | 47be61845c775643f1aa4d2a54343549f943c94c (patch) | |
| tree | 7bc3d07cecb30116a51bdf11dfa0540bfacc4e43 /fs/hfsplus | |
| parent | 285b102d3b745f3c2c110c9c327741d87e64aacc (diff) | |
| download | linux-47be61845c775643f1aa4d2a54343549f943c94c.tar.gz | |
fs/dcache.c: avoid soft-lockup in dput()
We triggered soft-lockup under stress test which open/access/write/close one file concurrently on more than five different CPUs: WARN: soft lockup - CPU#0 stuck for 11s! [who:30631] ... [<ffffffc0003986f8>] dput+0x100/0x298 [<ffffffc00038c2dc>] terminate_walk+0x4c/0x60 [<ffffffc00038f56c>] path_lookupat+0x5cc/0x7a8 [<ffffffc00038f780>] filename_lookup+0x38/0xf0 [<ffffffc000391180>] user_path_at_empty+0x78/0xd0 [<ffffffc0003911f4>] user_path_at+0x1c/0x28 [<ffffffc00037d4fc>] SyS_faccessat+0xb4/0x230 ->d_lock trylock may failed many times because of concurrently operations, and dput() may execute a long time. Fix this by replacing cpu_relax() with cond_resched(). dput() used to be sleepable, so make it sleepable again should be safe. Cc: <stable@vger.kernel.org> Signed-off-by: Wei Fang <fangwei1@huawei.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/hfsplus')
0 files changed, 0 insertions, 0 deletions