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From:   Mel Gorman <mgorman@techsingularity.net>
To:     Linux-MM <linux-mm@kvack.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@suse.com>, NeilBrown <neilb@suse.de>,
        Thierry Reding <thierry.reding@gmail.com>,
        Matthew Wilcox <willy@infradead.org>,
        Vlastimil Babka <vbabka@suse.cz>,
        LKML <linux-kernel@vger.kernel.org>,
        Mel Gorman <mgorman@techsingularity.net>
Subject: [PATCH 5/7] mm/page_alloc.c: Allow __GFP_NOFAIL requests deeper access to reserves
Date:   Mon,  9 Jan 2023 15:16:29 +0000
Message-Id: <20230109151631.24923-6-mgorman@techsingularity.net>
In-Reply-To: <20230109151631.24923-1-mgorman@techsingularity.net>
References: <20230109151631.24923-1-mgorman@techsingularity.net>
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Currently __GFP_NOFAIL allocations without any other flags can access 25%
of the reserves but these requests imply that the system cannot make forward
progress until the allocation succeeds. Allow __GFP_NOFAIL access to 75%
of the min reserve.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6f41b84a97ac..d2df78f5baa2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5308,7 +5308,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
 		 * could deplete whole memory reserves which would just make
 		 * the situation worse
 		 */
-		page = __alloc_pages_cpuset_fallback(gfp_mask, order, ALLOC_HARDER, ac);
+		page = __alloc_pages_cpuset_fallback(gfp_mask, order, ALLOC_MIN_RESERVE|ALLOC_HARDER, ac);
 		if (page)
 			goto got_pg;
 
-- 
2.35.3