From: Jeff Layton Date: Fri, 20 Mar 2015 19:15:14 +0000 (-0400) Subject: nfs: fix high load average due to callback thread sleeping X-Git-Tag: omap-for-v4.1/fixes-rc1~19^2~14 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5d05e54af3cdbb13cf19c557ff2184781b91a22c;p=pandora-kernel.git 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: Reported-by: Chuck Lever Signed-off-by: Jeff Layton Tested-by: Chuck Lever Fixes: commit 6ffa30d3f734 (“nfs: don't call blocking . . .”) Signed-off-by: Trond Myklebust --- Reading git-diff-tree failed