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Tue, 17 Jan 2023 16:18:42 -0800 (PST) Date: Wed, 18 Jan 2023 00:18:21 +0000 In-Reply-To: <20230118001827.1040870-1-talumbau@google.com> Mime-Version: 1.0 References: <20230118001827.1040870-1-talumbau@google.com> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Message-ID: <20230118001827.1040870-2-talumbau@google.com> Subject: [PATCH mm-unstable v1 1/7] mm: multi-gen LRU: section for working set protection From: "T.J. Alumbaugh" To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-mm@google.com, "T.J. Alumbaugh" Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam03 X-Stat-Signature: 8ctcat4hjiez47e8x686ufdceoj4bmpc X-Rspamd-Queue-Id: BE031180002 X-HE-Tag: 1674001123-512753 X-HE-Meta: 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 Xlx6n1Wc 7oayVv3DxRP+PDTC4sYSUP+pI3FrqVPX0S7GDFlPX0aVYUvIhgwo8ld1alAbFhve1jBbVJgsGIuVpfPa5kzclQvDwumLMScObdYYC85DTBw7vHKOKzkGjnVadB1jDjySARedGjzrAKeYmII8mfArzLbOwkTVOQq2BR0doLpQgrXovKo+IZTwYkPtA+mnB43zG6W2BZq/monltk5Clqvr/ow8fu2TGYOtNNeb252n7VJf8kjpo+20vpCrf5Nkt88CUzg2QjSODCCJRauW09t5H0d1/HVdMFUwLiA+NHsNHmt2mK3g8ag4ni9kYOwPQk5xMDpjLAaX0JBzAPtVUfV2fhlshCauM6N4U6y/d9emrGQGSCctW/ikJapCCRQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.014220, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add a section for working set protection in the code and the design doc. The admin doc already contains its usage. Signed-off-by: T.J. Alumbaugh --- Documentation/mm/multigen_lru.rst | 15 +++++++++++++++ mm/vmscan.c | 4 ++++ 2 files changed, 19 insertions(+) diff --git a/Documentation/mm/multigen_lru.rst b/Documentation/mm/multigen_lru.rst index d8f721f98868..6e1483e70fdc 100644 --- a/Documentation/mm/multigen_lru.rst +++ b/Documentation/mm/multigen_lru.rst @@ -141,6 +141,21 @@ loop has detected outlying refaults from the tier this page is in. To this end, the feedback loop uses the first tier as the baseline, for the reason stated earlier. +Working set protection +---------------------- +Each generation is timestamped at birth. If ``lru_gen_min_ttl`` is +set, an ``lruvec`` is protected from the eviction when its oldest +generation was born within ``lru_gen_min_ttl`` milliseconds. In other +words, it prevents the working set of ``lru_gen_min_ttl`` milliseconds +from getting evicted. The OOM killer is triggered if this working set +cannot be kept in memory. + +This time-based approach has the following advantages: + +1. It is easier to configure because it is agnostic to applications + and memory sizes. +2. It is more reliable because it is directly wired to the OOM killer. + Summary ------- The multi-gen LRU can be disassembled into the following parts: diff --git a/mm/vmscan.c b/mm/vmscan.c index 394ff4962cbc..a741765896b6 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -4475,6 +4475,10 @@ static bool try_to_inc_max_seq(struct lruvec *lruvec, unsigned long max_seq, return true; } +/****************************************************************************** + * working set protection + ******************************************************************************/ + static bool lruvec_is_sizable(struct lruvec *lruvec, struct scan_control *sc) { int gen, type, zone; -- 2.39.0.314.g84b9a713c41-goog