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[82.17.115.212]) by smtp.gmail.com with ESMTPSA id n1sm555664wro.36.2021.03.15.09.58.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Mar 2021 09:58:38 -0700 (PDT) From: Aaron Tomlin To: linux-mm@kvack.org Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org Subject: [PATCH] mm/page_alloc: try oom if reclaim is unable to make forward progress Date: Mon, 15 Mar 2021 16:58:37 +0000 Message-Id: <20210315165837.789593-1-atomlin@redhat.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=atomlin@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="US-ASCII" X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: C587AE11D1D9 X-Stat-Signature: sorjy158reafw4ehtd5fysyj8pqxhi6y Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf05; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=63.128.21.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615827522-854397 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: In the situation where direct reclaim is required to make progress for compaction but no_progress_loops is already over the limit of MAX_RECLAIM_RETRIES consider invoking the oom killer. Signed-off-by: Aaron Tomlin --- mm/page_alloc.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 7a2c89b21115..8d748b1b8d1e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4181,6 +4181,16 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsig= ned int order, return NULL; } =20 +static inline bool +should_try_oom(int no_progress_loops, + enum compact_result last_compact_result) +{ + if (no_progress_loops > MAX_RECLAIM_RETRIES && last_compact_result + =3D=3D COMPACT_SKIPPED) + return true; + return false; +} + static inline bool should_compact_retry(struct alloc_context *ac, int order, int alloc_flag= s, enum compact_result compact_result, @@ -4547,10 +4557,11 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned ord= er, * Make sure we converge to OOM if we cannot make any progress * several times in the row. */ - if (*no_progress_loops > MAX_RECLAIM_RETRIES) { - /* Before OOM, exhaust highatomic_reserve */ - return unreserve_highatomic_pageblock(ac, true); - } + if (*no_progress_loops > MAX_RECLAIM_RETRIES) + result false; + /* Last chance before OOM, try draining highatomic_reserve once */ + else if (*no_progress_loops =3D=3D MAX_RECLAIM_RETRIES) + return unreserve_highatomic_pageblock(ac, true) =20 /* * Keep reclaiming pages while there is a chance this will lead @@ -4822,6 +4833,8 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int= order, did_some_progress > 0, &no_progress_loops)) goto retry; =20 + if (should_try_oom(no_progress_loops, compact_result)) + goto oom: /* * It doesn't make any sense to retry for the compaction if the order-0 * reclaim is not able to make any progress because the current @@ -4839,6 +4852,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int= order, if (check_retry_cpuset(cpuset_mems_cookie, ac)) goto retry_cpuset; =20 +oom: /* Reclaim has failed us, start killing things */ page =3D __alloc_pages_may_oom(gfp_mask, order, ac, &did_some_progress)= ; if (page) --=20 2.26.2