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NFS: Add a cond_resched() to nfs_commit_release_pages() 

The commit list can get very large, and so we need a cond_resched()
in nfs_commit_release_pages() in order to ensure we don't hog the CPU
for excessive periods of time.

Reported-by: Mike Galbraith <efault@gmx.de>
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2017-12-18 14:39:13 -05:00
parent a8750ddca9
commit 7f1bda447c
1 changed files with 2 additions and 0 deletions
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2
fs/nfs/write.c
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@ -1837,6 +1837,8 @@ static void nfs_commit_release_pages(struct nfs_commit_data *data)
set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags);
next:
nfs_unlock_and_release_request(req);
/* Latency breaker */
cond_resched();
}
nfss = NFS_SERVER(data->inode);
if (atomic_long_read(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)