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From: Bryan Venteicher <bryanv@FreeBSD.org>
Date: Wed, 8 Oct 2014 04:11:05 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r272723 - stable/9/sys/vm
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Author: bryanv
Date: Wed Oct  8 04:11:05 2014
New Revision: 272723
URL: https://svnweb.freebsd.org/changeset/base/272723

Log:
  MFC 272550:
  
    Remove stray uma_mtx lock/unlock in zone_drain_wait()
  
    Callers of zone_drain_wait(M_WAITOK) do not need to hold (and were not)
    the uma_mtx, but we would attempt to unlock and relock the mutex if we
    had to sleep because the zone was already draining. The M_NOWAIT callers
    may hold the uma_mtx, but we do not sleep in that case.

Modified:
  stable/9/sys/vm/uma_core.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/vm/uma_core.c
==============================================================================
--- stable/9/sys/vm/uma_core.c	Wed Oct  8 04:07:07 2014	(r272722)
+++ stable/9/sys/vm/uma_core.c	Wed Oct  8 04:11:05 2014	(r272723)
@@ -761,9 +761,7 @@ zone_drain_wait(uma_zone_t zone, int wai
 	while (zone->uz_flags & UMA_ZFLAG_DRAINING) {
 		if (waitok == M_NOWAIT)
 			goto out;
-		mtx_unlock(&uma_mtx);
 		msleep(zone, zone->uz_lock, PVM, "zonedrain", 1);
-		mtx_lock(&uma_mtx);
 	}
 	zone->uz_flags |= UMA_ZFLAG_DRAINING;
 	bucket_cache_drain(zone);