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b=AyikNhCwZna5smqbj0GVWcCnGjutXLJmM9MvlPkDkDB9JJo/kn3io4tTvDe5tXMxW ZUJjlFamPUPfGq2Lmn76ybrIYQPDL4mzZUKVZjfcXGiJEJbIuTGjxD4BsugydnjM82 SYjbRfQXN+jByOKT3dN4kPhNrpx16KMLuEcCraBX3USkGOdvW9ZjV4wMzsktiY4DnE AzKko6VpADJ/YxX9/Lt+miy8YUFTjr9S/9QiCfYgStVLF53EtKXZC5nqHQKwklqp4g bDrDAPVc3LDJhQFcLdo/P3TnXopCbzVm1mlLKaifWc/rSGrOrBVgIjA9vyUz324zx3 XvksGDML0s4Wg== From: SJ Park To: Liew Rui Yan Cc: SJ Park , akpm@linux-foundation.org, damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, stable@vger.kernel.org Subject: Re: [PATCH v2.1] mm/damon/core: fix false positive in damos_quota_is_full() when esz is zero Date: Wed, 2 Sep 2026 07:48:03 -0700 Message-ID: <20260902144804.88298-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260902142254.5328-1-aethernet65535@gmail.com> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: c1r6cj8t91xx3qcd1a47kzgxsa8uqe86 X-Rspamd-Queue-Id: 1F7B51C0006 X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1788360491-806978 X-HE-Meta: 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 VUAyc0AC S5MTKdYdSDtBg/uaOLPG95tUns1XjcKeUNj89pjYuBjvL2zaXRlgaj/SqkQ58yg5oXCmsKY7WDgJhb9vA9EhgMODZh+/kqaN/tjMWO5enrpsDc1o0obLMiWX+0t8p9+vjv20aqXevk7oPynvM6CQUs8jWd/wNuJ717f3JUkE+iKYezMqOlj+GRRsY285v0zgye2Qbh/zJIKOSWYceJYt82wqYCJRUYxmfuDMirks3ykqOMMx0npD9J1kcgP9ekbxK2dJxc2XXgnIXMHICdQYSsm57hKefGpPJ4jsXMePMHgoUvEM= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, 2 Sep 2026 22:22:31 +0800 Liew Rui Yan wrote: > On Wed, 02 Sep 2026 07:10:00 -0700 SJ Park wrote: > > > On Wed, 2 Sep 2026 16:44:45 +0800 Liew Rui Yan wrote: > > > > > When setting goal_tuner to 'temporal', if the goal is achieved, > > > quota->esz_bp will be set to zero. In this case, damos_quota_is_full() > > > will always return true, even if no regions have been tried to apply at > > > all. This causes qt_exceeds to increase unexpectedly. > > > > To me, this looks logically correct. Could this cause any user issue? > > Yes, I think this might cause unnecessary confusion for users, If it is _might_ kind thing, please ask questions first, or add RFC tag at least. > at least > it did for me. If it confused you, definitely we need to fix it. But if it is just confusing, let's try to clarify by adding documentation, rather than changing existing behaviors. I feel like we also found similar case that people send patches to change some behaviors that confusing them, but not really problematic. That sometimes waste unnecessary time for understanding the intention of the patch. Please feel free to ask question first, if you found some confusing behaviors and don't know why it behaves in the way or if it is a real problem. Thanks, SJ [...]