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From:   Aaron Tomlin <atomlin@redhat.com>
To:     linux-mm@kvack.org
Cc:     akpm@linux-foundation.org, vbabka@suse.cz, mhocko@suse.com,
        linux-kernel@vger.kernel.org
Subject: [PATCH v2] mm/page_alloc: bail out on fatal signal during reclaim/compaction retry attempt
Date:   Wed, 19 May 2021 20:23:21 +0100
Message-Id: <20210519192321.3247175-1-atomlin@redhat.com>
MIME-Version: 1.0
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Precedence: bulk

It does not make sense to retry compaction when a fatal signal is
pending.

In the context of try_to_compact_pages(), indeed COMPACT_SKIPPED can be
returned; albeit, not every zone, on the zone list, would be considered
in the case a fatal signal is found to be pending.
Yet, in should_compact_retry(), given the last known compaction result,
each zone, on the zone list, can be considered/or checked
(see compaction_zonelist_suitable()). For example, if a zone was found
to succeed, then reclaim/compaction would be tried again
(notwithstanding the above).

This patch ensures that compaction is not needlessly retried
irrespective of the last known compaction result e.g. if it was skipped,
in the unlikely case a fatal signal is found pending.
So, OOM is at least attempted.

Signed-off-by: Aaron Tomlin <atomlin@redhat.com>
---
 mm/page_alloc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index aaa1655cf682..49f416ffb54f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4252,6 +4252,9 @@ should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
 	if (!order)
 		return false;
 
+	if (fatal_signal_pending(current))
+		goto out;
+
 	if (compaction_made_progress(compact_result))
 		(*compaction_retries)++;
 
-- 
2.26.3