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Sun, 28 Jun 2026 01:55:38 -0700 (PDT) From: Liew Rui Yan To: sj@kernel.org Cc: aethernet65535@gmail.com, damon@lists.linux.dev, linux-mm@kvack.org Subject: Re: [RFC PATCH] mm/damon/reclaim: add 'available' memory as an optional watermarks metric Date: Sun, 28 Jun 2026 16:55:38 +0800 Message-ID: <20260628085547.21814-1-aethernet65535@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260627222645.26834-1-sj@kernel.org> References: <20260627222645.26834-1-sj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 858E8140004 X-Stat-Signature: eum6d1qqxfsehq39759a8hthan8nkngr X-HE-Tag: 1782636940-462005 X-HE-Meta: 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 UvRs2iwU xPKuO4nuPATQqlpE4QU7eOh0wWG6SbTUxI/MUgF3+xBV+4SgkZnnLaTEerYy5TN47b3AU++PmAg6zvzZZdhXNxmjYh37gShopJbdBId8OeC+I/uo5WpFCsdsS9T4zSoVRa/n6RYVFvNNuHJPV+G5b90QHad9kw6YFJOXv0ykAXJcPwUvmPkqCKQ6F5WYWJZ10EQlaOTkq6RILfWr2hUaRYUpHqff0NNneCwuLcHLHU0IP0fdMqpclROLgSCl0FCzqvgmZDB5S1lfYT/CHOxv2XZK7oKayt8vNihSX4YuU2z5BwfvccKqwe60f3avCtfrp74ny9njkwjvwySNJ4cJfKgUz6gjpgGS55sWkChKGxUZZidvs39qOH8DY89dsdkiXlMxzkt26Qa8OyGWA2KLqJakhKNqHYjzrGRgKYEevNzoXLKwAqR0QO28AKBtf1yqM07UyOsMqv5v9t1glrLREvAYN8npQctzn900U Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sat, 27 Jun 2026 15:26:43 -0700 SJ Park wrote: > > I will drop this patch. I think controlling DAMOS pause/rusume > > separately might be better suited for execution in user space (such as > > controlling‘quota_ms’ and ‘quota_sz’). > > For explicit DAMOS-only pause/resume, you may also be interested in > max_nr_snapshots [1] feature. Thank you for the pointer to the 'max_nr_snapshots' feature! > > > > By the way, I sent you an email about three weeks ago (Fri, 5 Jun 2026 > > 20:28:00 +0800) introducing a userspace auto-tuner program I wrote for > > DAMON_RECLAIM's 'min_age', and asking for your thoughts. I am not sure > > if it reached you, could you please check? I would really appreciate > > your feedback on that as well. > > I don't recall that mail. Did you send that to damon@lists.linux.dev or other > public mailing lists? If so, could you share the message id or lore.kernel.org > link of the mail? If not, could you please resend? I hadn't previously sent this to damon@lists.linux.dev or any public mailing list. Since I have completely rewritten it (the email) and it focuses on a standalone userspace program/daemon, I have submitted it as a new independent RFC thread [1] to avoid biasing this patch's topic. > [1] https://lkml.kernel.org/r/20251216080128.42991-8-sj@kernel.org [1] https://lore.kernel.org/damon/20260628085155.20828-1-aethernet65535@gmail.com Best regards, Rui Yan