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authorRichard Yao <[email protected]>2015-09-07 12:35:21 -0400
committerBrian Behlendorf <[email protected]>2015-09-09 14:30:47 -0700
commitd4bf6d8429371634b0c6bcc14b5868d849b7c07d (patch)
treee49727247632bc36448f61186b6a76e88c79d2a4 /module/spl
parent4fa4cab972899ecf6266c23986159a109dbcac5b (diff)
Disable direct reclaim in taskq worker threads on Linux 3.9+
Illumos does not have direct reclaim and code run inside taskq worker threads is not designed to deal with it. Allowing direct reclaim inside a worker thread can therefore deadlock. We set PF_MEMALLOC_NOIO through memalloc_noio_save() to indicate to the kernel's reclaim code that we are inside a context where memory allocations cannot be allowed to block on filesystem activity. Signed-off-by: Richard Yao <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue zfsonlinux/zfs#1274 Issue zfsonlinux/zfs#2390 Closes #474
Diffstat (limited to 'module/spl')
-rw-r--r--module/spl/spl-taskq.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/module/spl/spl-taskq.c b/module/spl/spl-taskq.c
index 82e71a388..f6ef56251 100644
--- a/module/spl/spl-taskq.c
+++ b/module/spl/spl-taskq.c
@@ -817,6 +817,10 @@ taskq_thread(void *args)
tq = tqt->tqt_tq;
current->flags |= PF_NOFREEZE;
+ #if defined(PF_MEMALLOC_NOIO)
+ (void) memalloc_noio_save();
+ #endif
+
sigfillset(&blocked);
sigprocmask(SIG_BLOCK, &blocked, NULL);
flush_signals(current);