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b=00g056k+tEkI32NIisZsCQvMYQp5ROzX9fOHTu1pAzX+o8FerDwSehyU7kto5XYpf inT4CgZVj+9JnnHV5gFHuwZyLJq7wkQDJqo9OtdQ3H1s7yKFt1ykqrHIRvdyCue9ZE lKxA/wiDhr7BiWZrCs7gxYaQo8og8Vd5Cud2qNMk= Date: Thu, 31 Oct 2024 17:27:19 -0700 From: Andrew Morton To: SeongJae Park Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com Subject: Re: [PATCH 0/2] mm/damon/core: fix handling of zero non-sampling intervals Message-Id: <20241031172719.8051cdd90e3c2187c609bb4e@linux-foundation.org> In-Reply-To: <20241031183757.49610-1-sj@kernel.org> References: <20241031183757.49610-1-sj@kernel.org> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Stat-Signature: 5zabcd7mmm5cuquock8sqzjfrwizja4m X-Rspamd-Queue-Id: DCE834000D X-Rspam-User: X-HE-Tag: 1730469254-457627 X-HE-Meta: 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 ZTCNrd6E aLZIkPn8RW4UxbINuiq60Wn57sKQ99o6nv8E5vxPeHQi1G2OiNPvxeIIw8oo3wU7WRHMmUPYhHxMW1HcwMYZgaew6a4+0rQK5bHPfAKp+bXqn5+CLiJc3wfB3/v5vD/075xk3iy7DAXcOjMRYL0pwIApiR0Twx8oRMK2E+8iwmR+SvWVXveoJE18woDq7xOvhKT6U0iMh+/rsflugjlXICi4xa/0KODGcITL/V1FRGJ4FoicETlQ0TyEEZcBrTxFDB6sLaE0SrIGdn64= 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: List-Subscribe: List-Unsubscribe: On Thu, 31 Oct 2024 11:37:55 -0700 SeongJae Park wrote: > DAMON's internal intervals accounting logic is not correctly handling > non-sampling intervals of zero values for a wrong assumption. This > could cause unexpected monitoring behavior, and even result in infinite > hang of DAMON sysfs interface user threads in case of zero aggregation > interval. Fix those by updating the intervals accounting logic. For > details of the root case and solutions, please refer to commit messages > of fixes. Thanks. fyi, there has been email lossage here. Only [2/2] hit my inbox. Neither [1/2] not [2/2] are in my linux-mm folder. I found the whole series in my linux-kernel folder.