[merged] use-round_jiffies-for-slow-work-thread-pools-cull-and-oom-timers.patch removed from -mm tree

[merged] use-round_jiffies-for-slow-work-thread-pools-cull-and-oom-timers.patch removed from -mm tree

[akpm]

The patch titled
     slow-work: use round_jiffies() for thread pool's cull and OOM timers
has been removed from the -mm tree.  Its filename was
     use-round_jiffies-for-slow-work-thread-pools-cull-and-oom-timers.patch

This patch was dropped because it was merged into mainline or a subsystem tree

The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/

------------------------------------------------------
Subject: slow-work: use round_jiffies() for thread pool's cull and OOM timers
From: Chris Peterson <cpeterso@cpeterso.com>

Round the slow work queue's cull and OOM timeouts to whole second boundary
with round_jiffies().  The slow work queue uses a pair of timers to cull
idle threads and, after OOM, to delay new thread creation.

This patch also extracts the mod_timer() logic for the cull timer into a
separate helper function.

By rounding non-time-critical timers such as these to whole seconds, they
will be batched up to fire at the same time rather than being spread out. 
This allows the CPU wake up less, which saves power.

Signed-off-by: Chris Peterson <cpeterso@cpeterso.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/slow-work.c |   23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff -puN kernel/slow-work.c~use-round_jiffies-for-slow-work-thread-pools-cull-and-oom-timers kernel/slow-work.c
--- a/kernel/slow-work.c~use-round_jiffies-for-slow-work-thread-pools-cull-and-oom-timers
+++ a/kernel/slow-work.c
@@ -319,6 +319,15 @@ cant_get_ref:
 EXPORT_SYMBOL(slow_work_enqueue);
 
 /*
+ * Schedule a cull of the thread pool at some time in the near future
+ */
+static void slow_work_schedule_cull(void)
+{
+	mod_timer(&slow_work_cull_timer,
+		  round_jiffies(jiffies + SLOW_WORK_CULL_TIMEOUT));
+}
+
+/*
  * Worker thread culling algorithm
  */
 static bool slow_work_cull_thread(void)
@@ -335,8 +344,7 @@ static bool slow_work_cull_thread(void)
 		    list_empty(&vslow_work_queue) &&
 		    atomic_read(&slow_work_thread_count) >
 		    slow_work_min_threads) {
-			mod_timer(&slow_work_cull_timer,
-				  jiffies + SLOW_WORK_CULL_TIMEOUT);
+			slow_work_schedule_cull();
 			do_cull = true;
 		}
 	}
@@ -393,8 +401,7 @@ static int slow_work_thread(void *_data)
 			    list_empty(&vslow_work_queue) &&
 			    atomic_read(&slow_work_thread_count) >
 			    slow_work_min_threads)
-				mod_timer(&slow_work_cull_timer,
-					  jiffies + SLOW_WORK_CULL_TIMEOUT);
+				slow_work_schedule_cull();
 			continue;
 		}
 
@@ -458,7 +465,7 @@ static void slow_work_new_thread_execute
 		if (atomic_dec_and_test(&slow_work_thread_count))
 			BUG(); /* we're running on a slow work thread... */
 		mod_timer(&slow_work_oom_timer,
-			  jiffies + SLOW_WORK_OOM_TIMEOUT);
+			  round_jiffies(jiffies + SLOW_WORK_OOM_TIMEOUT));
 	} else {
 		/* ratelimit the starting of new threads */
 		mod_timer(&slow_work_oom_timer, jiffies + 1);
@@ -502,8 +509,7 @@ static int slow_work_min_threads_sysctl(
 			if (n < 0 && !slow_work_may_not_start_new_thread)
 				slow_work_enqueue(&slow_work_new_thread);
 			else if (n > 0)
-				mod_timer(&slow_work_cull_timer,
-					  jiffies + SLOW_WORK_CULL_TIMEOUT);
+				slow_work_schedule_cull();
 		}
 		mutex_unlock(&slow_work_user_lock);
 	}
@@ -529,8 +535,7 @@ static int slow_work_max_threads_sysctl(
 				atomic_read(&slow_work_thread_count);
 
 			if (n < 0)
-				mod_timer(&slow_work_cull_timer,
-					  jiffies + SLOW_WORK_CULL_TIMEOUT);
+				slow_work_schedule_cull();
 		}
 		mutex_unlock(&slow_work_user_lock);
 	}
_

Patches currently in -mm which might be from cpeterso@cpeterso.com are

origin.patch