If direct reclaim failed, unreserve highatomic pageblock immediately is better than unreserve in should_reclaim_retry(). We may get page in next try rather than reclaim-compact-reclaim-compact...
Signed-off-by: Xishi Qiu <[email protected]> --- mm/page_alloc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 2331840..2bd19d0 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3421,7 +3421,8 @@ void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...) bool drained = false; *did_some_progress = __perform_reclaim(gfp_mask, order, ac); - if (unlikely(!(*did_some_progress))) + if (unlikely(!(*did_some_progress) + && !unreserve_highatomic_pageblock(ac, false))) return NULL; retry: -- 1.8.3.1
