From: Brian Behlendorf <behlendorf1@llnl.gov>
Date: Fri, 6 May 2011 22:21:58 +0000 (-0700)
Subject: Add TASKQ_NORECLAIM flag
X-Git-Tag: debian/0.7.9-2~291^2
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=372c2572336468cbf60272aa7e735b7ca0c3807c;p=mirror_spl-debian.git

Add TASKQ_NORECLAIM flag

It has become necessary to be able to optionally disable
direct memory reclaim for certain taskqs.  To support
this the TASKQ_NORECLAIM flags has been added which sets
the PF_MEMALLOC bit for all threads in the taskq.
---

diff --git a/include/sys/taskq.h b/include/sys/taskq.h
index c83409d..57f8b1c 100644
--- a/include/sys/taskq.h
+++ b/include/sys/taskq.h
@@ -40,6 +40,7 @@
 #define TASKQ_DYNAMIC           0x00000004
 #define TASKQ_THREADS_CPU_PCT   0x00000008
 #define TASKQ_DC_BATCH          0x00000010
+#define TASKQ_NORECLAIM         0x00000020
 
 typedef unsigned long taskqid_t;
 typedef void (task_func_t)(void *);
diff --git a/module/spl/spl-taskq.c b/module/spl/spl-taskq.c
index 5a17f1c..f9ee570 100644
--- a/module/spl/spl-taskq.c
+++ b/module/spl/spl-taskq.c
@@ -371,6 +371,10 @@ taskq_thread(void *args)
         ASSERT(tq);
         current->flags |= PF_NOFREEZE;
 
+	/* Disable the direct memory reclaim path */
+	if (tq->tq_flags & TASKQ_NORECLAIM)
+		current->flags |= PF_MEMALLOC;
+
         sigfillset(&blocked);
         sigprocmask(SIG_BLOCK, &blocked, NULL);
         flush_signals(current);