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Subject[PATCH 05/12] 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>
---
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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