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Wed, 4 Jun 2025 13:46:15 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id CCSLJCdOQGhzaQAAD6G6ig (envelope-from ); Wed, 04 Jun 2025 13:46:15 +0000 Message-ID: <1aa7c368-c37f-4b00-876c-dcf51a523c42@suse.cz> Date: Wed, 4 Jun 2025 15:46:15 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm: fix the inaccurate memory statistics issue for users Content-Language: en-US To: Baolin Wang , Shakeel Butt , Michal Hocko Cc: Andrew Morton , david@redhat.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, rppt@kernel.org, surenb@google.com, donettom@linux.ibm.com, aboorvad@linux.ibm.com, sj@kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org References: <4f0fd51eb4f48c1a34226456b7a8b4ebff11bf72.1748051851.git.baolin.wang@linux.alibaba.com> <20250529205313.a1285b431bbec2c54d80266d@linux-foundation.org> <72f0dc8c-def3-447c-b54e-c390705f8c26@linux.alibaba.com> <7307bb7a-7c45-43f7-b073-acd9e1389000@linux.alibaba.com> <250ec733-8b2d-4c56-858c-6aada9544a55@linux.alibaba.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 7AB8620011 X-Stat-Signature: z5joay1fwuxx9kjzp9oohfjegirz1bkw X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1749044777-948528 X-HE-Meta: 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 x3SUtF0c 457fyVIWLyt7GmgXIdDtB7BGKGL896WoUo6+/YhAUx6YuG6BtO/bBL3y+cRtI+ICdMO7egVILnbxOyuR8oTnZchm3AHmMFRjyGwH2OlKnwEk9500ERCPd0lE4q6PXqkB35GKY3bBqvgtkdIhji8TK/VYNr5B3AR2/NwljDaJjGA2T6PKfC6ZfVzJlfzSsLfkSf6my998y1tmpCuLlIJGdofpcXjo09RpCLTD7zN0ACw6DQcwLzoPZPMy8p4JZdgH3wSWMaI8Y1YzEMORKyxgbRIjDTJQyz1W1yF6P 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 6/4/25 14:46, Baolin Wang wrote: >> Baolin, please run stress-ng command that stresses minor anon page >> faults in multiple threads and then run multiple bash scripts which cat >> /proc/pidof(stress-ng)/status. That should be how much the stress-ng >> process is impacted by the parallel status readers versus without them. > > Sure. Thanks Shakeel. I run the stress-ng with the 'stress-ng --fault 32 > --perf -t 1m' command, while simultaneously running the following > scripts to read the /proc/pidof(stress-ng)/status for each thread. How many of those scripts? > From the following data, I did not observe any obvious impact of this > patch on the stress-ng tests when repeatedly reading the > /proc/pidof(stress-ng)/status. > > w/o patch > stress-ng: info: [6891] 3,993,235,331,584 CPU Cycles > 59.767 B/sec > stress-ng: info: [6891] 1,472,101,565,760 Instructions > 22.033 B/sec (0.369 instr. per cycle) > stress-ng: info: [6891] 36,287,456 Page Faults Total > 0.543 M/sec > stress-ng: info: [6891] 36,287,456 Page Faults Minor > 0.543 M/sec > > w/ patch > stress-ng: info: [6872] 4,018,592,975,968 CPU Cycles > 60.177 B/sec > stress-ng: info: [6872] 1,484,856,150,976 Instructions > 22.235 B/sec (0.369 instr. per cycle) > stress-ng: info: [6872] 36,547,456 Page Faults Total > 0.547 M/sec > stress-ng: info: [6872] 36,547,456 Page Faults Minor > 0.547 M/sec > > ========================= > #!/bin/bash > > # Get the PIDs of stress-ng processes > PIDS=$(pgrep stress-ng) > > # Loop through each PID and monitor /proc/[pid]/status > for PID in $PIDS; do > while true; do > cat /proc/$PID/status > usleep 100000 Hm but this limits the reading to 10 per second? If we want to simulate an adversary process, it should be without the sleeps I think? > done & > done