From: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
To: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Hugh Dickins <hughd@google.com>,
David Rientjes <rientjes@google.com>,
LKML <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: [PATCH 05/12] thp: remove wake_up_interruptible in the exit path
Date: Mon, 13 Aug 2012 19:14:48 +0800 [thread overview]
Message-ID: <5028E1A8.4010402@linux.vnet.ibm.com> (raw)
In-Reply-To: <5028E12C.70101@linux.vnet.ibm.com>
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>
---
mm/huge_memory.c | 35 +++++++++++++++++++++--------------
1 files changed, 21 insertions(+), 14 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index b218700..86f71af 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;
}
@@ -2236,7 +2234,7 @@ 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)
@@ -2303,6 +2301,24 @@ 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;
@@ -2327,17 +2343,8 @@ 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();
}
}
--
1.7.7.6
--
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next prev parent reply other threads:[~2012-08-13 11:14 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-13 11:12 [PATCH 00/12] thp: optimize use of khugepaged_mutex and dependence of CONFIG_NUMA Xiao Guangrong
2012-08-13 11:13 ` [PATCH 01/12] thp: fix the count of THP_COLLAPSE_ALLOC Xiao Guangrong
2012-08-13 11:19 ` Kirill A. Shutemov
2012-08-13 11:13 ` [PATCH 02/12] thp: remove unnecessary check in start_khugepaged Xiao Guangrong
2012-08-13 11:14 ` [PATCH 03/12] thp: move khugepaged_mutex out of khugepaged Xiao Guangrong
2012-08-13 11:14 ` [PATCH 04/12] thp: remove unnecessary khugepaged_thread check Xiao Guangrong
2012-08-13 11:14 ` Xiao Guangrong [this message]
2012-08-13 11:15 ` [PATCH 06/12] thp: remove some code depend on CONFIG_NUMA Xiao Guangrong
2012-08-13 11:15 ` [PATCH 07/12] thp: merge page pre-alloc in khugepaged_loop into khugepaged_do_scan Xiao Guangrong
2012-08-13 11:16 ` [PATCH 08/12] thp: release page in page pre-alloc path Xiao Guangrong
2012-08-13 11:16 ` [PATCH 09/12] thp: introduce khugepaged_prealloc_page and khugepaged_alloc_page Xiao Guangrong
2012-09-12 2:03 ` Hugh Dickins
2012-09-12 2:35 ` Xiao Guangrong
2012-09-12 3:37 ` Xiao Guangrong
2012-09-13 6:27 ` Hugh Dickins
2012-09-13 6:33 ` Hugh Dickins
2012-09-13 9:26 ` Xiao Guangrong
2012-08-13 11:16 ` [PATCH 10/12] thp: remove khugepaged_loop Xiao Guangrong
2012-08-13 11:17 ` [PATCH 11/12] thp: use khugepaged_enabled to remove duplicate code Xiao Guangrong
2012-08-13 11:17 ` [PATCH 12/12] thp: remove unnecessary set_recommended_min_free_kbytes Xiao Guangrong
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