From 2017c0bff8ba79ea527361adbe19471e174775d6 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Mon, 8 Oct 2012 16:29:44 -0700 Subject: [PATCH] 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 Cc: Andrea Arcangeli Cc: Hugh Dickins Cc: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/huge_memory.c | 35 +++++++++++++++++++++-------------- 1 file changed, 21 insertions(+), 14 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 46e3f150a6ca..a94c07a1b3c5 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(); } } -- 2.34.1