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b=dOTDcPAN27JEc0aoYvLAzmR+L1LIxNUknSz4dQ1rJSa02UmlZG3h8g8cd9j4r51pC YRrUzY3/OA0NehmrglV+le3T7pHax2YBcDVljkFi5zLAcFP7lyRw/UNr/CxbHotPdS R2ScqitwzblTJF4bxXgZ1eJq3+oEOvNf+9/Mob/HJiUPkagnLKyMSz4DpRJRdJHUYq RsSwrEhz6+OtOQXBrxGaAHK/5brpTdYOP93RIdxL9vg5MUD6vhp+K3JP/RTta0TZ1R 8V5r2SZ6dRkRH1XmkRnVsc+rCbLCp1YpLQPiHyChBXxgo38oqG/ebKa3bve8U+uf7t 2baotgtsoaBVw== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , "# 6 . 17 . x" , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2] mm/damon/stat: monitor all System RAM resources Date: Mon, 16 Mar 2026 12:34:49 -0700 Message-ID: <20260316193449.6053-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260316102539.2af039f5ca7ce1164da34b47@linux-foundation.org> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 4E91E140011 X-Stat-Signature: pk4tqydsbgp6sq6ki5daq74d37k5xks4 X-HE-Tag: 1773689692-754484 X-HE-Meta: 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 KZT2Skjv Tyyb9D647IpRUuBBZbq1v3gJcuIrbQ0UmaOw24LZ83e8xIr2TkkZ8IO8fJukqLEc0CbYelaYzmUJcGe9aUXnxrmBc/HysBe5LFdRKfG7qrZdRRaaBquL4Kp4zdXb68CTqn6+u1MyyU3lVTC/tUIIxnqqpNvt1V5M0NVPJvW9KieXN+u4vu3R8op1zuuDBNqo5DAkNng4hHUrNs0LschkGfeKxpmJViRABxL0cm54/KkiD2tMgA7w+hfj0mw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 16 Mar 2026 10:25:39 -0700 Andrew Morton wrote: > On Sun, 15 Mar 2026 09:27:15 -0700 SeongJae Park wrote: > > > DAMON_STAT usage document (Documentation/admin-guide/mm/damon/stat.rst) > > says it monitors the system's entire physical memory. But, it is > > monitoring only the biggest System RAM resource of the system. When > > there are multiple System RAM resources, this results in monitoring only > > an unexpectedly small fraction of the physical memory. For example, > > suppose the system has a 500 GiB System RAM, 10 MiB non-System RAM, and > > 500 GiB System RAM resources in order on the physical address space. > > DAMON_STAT will monitor only the first 500 GiB System RAM. This > > situation is particularly common on NUMA systems. > > > > Select a physical address range that covers all System RAM areas of the > > system, to fix this issue and make it work as documented. > > > > Fixes: 369c415e6073 ("mm/damon: introduce DAMON_STAT module") > > Cc: # 6.17.x > > This doesn't apply to current mainline? Ah, you're right. Sorry for this noise. I will rebase it to mm-hotfixes-unstable and post it as v3, by tonight. If you prefer mainline or another tree other than mm-hotfixes-unsable as the baseline of v3, please let me know. Thanks, SJ