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authorJeff Layton <jlayton@poochiereds.net>2015-03-20 20:15:14 +0100
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-04-23 20:38:07 +0200
commit5d05e54af3cdbb13cf19c557ff2184781b91a22c (patch)
treef67bf3bdb8ad1fd4cc61ec8d0e23dfafdcbd3f8b /Documentation/java.txt
parentNFS: Reduce time spent holding the i_mutex during fallocate() (diff)
downloadlinux-5d05e54af3cdbb13cf19c557ff2184781b91a22c.tar.xz
linux-5d05e54af3cdbb13cf19c557ff2184781b91a22c.zip
nfs: fix high load average due to callback thread sleeping
Chuck pointed out a problem that crept in with commit 6ffa30d3f734 (nfs: don't call blocking operations while !TASK_RUNNING). Linux counts tasks in uninterruptible sleep against the load average, so this caused the system's load average to be pinned at at least 1 when there was a NFSv4.1+ mount active. Not a huge problem, but it's probably worth fixing before we get too many complaints about it. This patch converts the code back to use TASK_INTERRUPTIBLE sleep, simply has it flush any signals on each loop iteration. In practice no one should really be signalling this thread at all, so I think this is reasonably safe. With this change, there's also no need to game the hung task watchdog so we can also convert the schedule_timeout call back to a normal schedule. Cc: <stable@vger.kernel.org> Reported-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Jeff Layton <jeff.layton@primarydata.com> Tested-by: Chuck Lever <chuck.lever@oracle.com> Fixes: commit 6ffa30d3f734 (“nfs: don't call blocking . . .”) Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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