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Mon, 21 Apr 2025 02:14:07 -0700 (PDT) From: Zhongkun He To: akpm@linux-foundation.org Cc: hannes@cmpxchg.org, mhocko@suse.com, yosry.ahmed@linux.dev, muchun.song@linux.dev, yuzhao@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Zhongkun He Subject: [PATCH V4 2/4] mm: vmscan: add more comments about cache_trim_mode Date: Mon, 21 Apr 2025 17:13:29 +0800 Message-Id: <4baad87ba637f1e6f666e9b99b3fdcb7ab39171b.1745225696.git.hezhongkun.hzk@bytedance.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add more comments for cache_trim_mode, and the annotations provided by Johannes Weiner in [1]. [1]: https://lore.kernel.org/all/20250314141833.GA1316033@cmpxchg.org/ Signed-off-by: Zhongkun He --- mm/vmscan.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index ebe1407f6741..49eb2a4e490d 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2530,7 +2530,8 @@ static void get_scan_count(struct lruvec *lruvec, str= uct scan_control *sc, =20 /* * If there is enough inactive page cache, we do not reclaim - * anything from the anonymous working right now. + * anything from the anonymous working right now to make sure + * a streaming file access pattern doesn't cause swapping. */ if (sc->cache_trim_mode) { scan_balance =3D SCAN_FILE; --=20 2.39.5