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authorXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>2012-10-08 16:29:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:22:26 +0900
commit2017c0bff8ba79ea527361adbe19471e174775d6 (patch)
treea5d6e611ac06180e19bc6a5a3189668259a99742 /mm/huge_memory.c
parente060f0e0139b83f05bb90fa05563d14179b9a7ff (diff)
thp: remove wake_up_interruptible in the exit path
Add the check of kthread_should_stop() to the conditions which are used to wakeup on khugepaged_wait, then kthread_stop is enough to let the thread exit Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c35
1 files changed, 21 insertions, 14 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 46e3f150a6c..a94c07a1b3c 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -154,8 +154,6 @@ static int start_khugepaged(void)
set_recommended_min_free_kbytes();
} else if (khugepaged_thread) {
- /* wakeup to exit */
- wake_up_interruptible(&khugepaged_wait);
kthread_stop(khugepaged_thread);
khugepaged_thread = NULL;
}
@@ -2221,7 +2219,7 @@ static int khugepaged_has_work(void)
static int khugepaged_wait_event(void)
{
return !list_empty(&khugepaged_scan.mm_head) ||
- !khugepaged_enabled();
+ kthread_should_stop();
}
static void khugepaged_do_scan(struct page **hpage)
@@ -2288,6 +2286,24 @@ static struct page *khugepaged_alloc_hugepage(void)
}
#endif
+static void khugepaged_wait_work(void)
+{
+ try_to_freeze();
+
+ if (khugepaged_has_work()) {
+ if (!khugepaged_scan_sleep_millisecs)
+ return;
+
+ wait_event_freezable_timeout(khugepaged_wait,
+ kthread_should_stop(),
+ msecs_to_jiffies(khugepaged_scan_sleep_millisecs));
+ return;
+ }
+
+ if (khugepaged_enabled())
+ wait_event_freezable(khugepaged_wait, khugepaged_wait_event());
+}
+
static void khugepaged_loop(void)
{
struct page *hpage;
@@ -2312,17 +2328,8 @@ static void khugepaged_loop(void)
if (hpage)
put_page(hpage);
#endif
- try_to_freeze();
- if (unlikely(kthread_should_stop()))
- break;
- if (khugepaged_has_work()) {
- if (!khugepaged_scan_sleep_millisecs)
- continue;
- wait_event_freezable_timeout(khugepaged_wait, false,
- msecs_to_jiffies(khugepaged_scan_sleep_millisecs));
- } else if (khugepaged_enabled())
- wait_event_freezable(khugepaged_wait,
- khugepaged_wait_event());
+
+ khugepaged_wait_work();
}
}