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mm/page_alloc: add a missing mm_page_alloc_zone_locked() tracepoint 

The trace point *trace_mm_page_alloc_zone_locked()* in __rmqueue() does
not currently cover all branches.  Add the missing tracepoint and check
the page before do that.

[akpm@linux-foundation.org: use IS_ENABLED() to suppress warning]

Link: https://lkml.kernel.org/r/20201228132901.41523-1-carver4lio@163.com
Signed-off-by: Hailong liu <liu.hailong6@zte.com.cn>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hailong liu 2021-01-12 15:49:08 -08:00 committed by Linus Torvalds
parent 8ff60eb052
commit ce8f86ee94
1 changed files with 16 additions and 15 deletions
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31
mm/page_alloc.c
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@ -2862,20 +2862,20 @@ __rmqueue(struct zone *zone, unsigned int order, int migratetype,
{
struct page *page;
#ifdef CONFIG_CMA
/*
* Balance movable allocations between regular and CMA areas by
* allocating from CMA when over half of the zone's free memory
* is in the CMA area.
*/
if (alloc_flags & ALLOC_CMA &&
zone_page_state(zone, NR_FREE_CMA_PAGES) >
zone_page_state(zone, NR_FREE_PAGES) / 2) {
page = __rmqueue_cma_fallback(zone, order);
if (page)
return page;
if (IS_ENABLED(CONFIG_CMA)) {
/*
* Balance movable allocations between regular and CMA areas by
* allocating from CMA when over half of the zone's free memory
* is in the CMA area.
*/
if (alloc_flags & ALLOC_CMA &&
zone_page_state(zone, NR_FREE_CMA_PAGES) >
zone_page_state(zone, NR_FREE_PAGES) / 2) {
page = __rmqueue_cma_fallback(zone, order);
if (page)
goto out;
}
}
#endif
retry:
page = __rmqueue_smallest(zone, order, migratetype);
if (unlikely(!page)) {
@ -2886,8 +2886,9 @@ retry:
alloc_flags))
goto retry;
}
trace_mm_page_alloc_zone_locked(page, order, migratetype);
out:
if (page)
trace_mm_page_alloc_zone_locked(page, order, migratetype);
return page;
}