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Thu, 27 Mar 2025 11:53:30 +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 CNgjJDo85WdlMAAAD6G6ig (envelope-from ); Thu, 27 Mar 2025 11:53:30 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id 49C00A082A; Thu, 27 Mar 2025 12:53:30 +0100 (CET) Date: Thu, 27 Mar 2025 12:53:30 +0100 From: Jan Kara To: Luis Chamberlain Cc: patches@lists.linux.dev, fstests@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, oliver.sang@intel.com, hannes@cmpxchg.org, willy@infradead.org, jack@suse.cz, apopple@nvidia.com, brauner@kernel.org, hare@suse.de, oe-lkp@lists.linux.dev, lkp@intel.com, john.g.garry@oracle.com, p.raghav@samsung.com, da.gomez@samsung.com, dave@stgolabs.net, riel@surriel.com, krisman@suse.de, boris@bur.io, jackmanb@google.com, gost.dev@samsung.com Subject: Re: [PATCH] generic/764: fsstress + migrate_pages() test Message-ID: References: <20250326185101.2237319-1-mcgrof@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250326185101.2237319-1-mcgrof@kernel.org> X-Rspamd-Action: no action X-Rspamd-Server: rspam01 X-Stat-Signature: bu7xbue7rakab67poutug39nfan8rfji X-Rspam-User: X-Rspamd-Queue-Id: B554A18000F X-HE-Tag: 1743076412-664715 X-HE-Meta: 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 51s2dReE VRGT2 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 Wed 26-03-25 11:50:55, Luis Chamberlain wrote: > 0-day reported a page migration kernel warning with folios which happen > to be buffer-heads [0]. I'm having a terribly hard time reproducing the bug > and so I wrote this test to force page migration filesystems. > > It turns out we have have no tests for page migration on fstests or ltp, > and its no surprise, other than compaction covered by generic/750 there > is no easy way to trigger page migration right now unless you have a > numa system. > > We should evaluate if we want to help stress test page migration > artificially by later implementing a way to do page migration on simple > systems to an artificial target. > > So far, this doesn't trigger any kernel splats, not even warnings for me. > > Reported-by: kernel test robot > Link: https://lore.kernel.org/r/202503101536.27099c77-lkp@intel.com # [0] > Signed-off-by: Luis Chamberlain So when I was testing page migration in the past MM guys advised me to use THP compaction as a way to trigger page migration. You can manually trigger compaction by: echo 1 >/proc/sys/vm/compact_memory So you first mess with the page cache a bit to fragment memory and then call the above to try to compact it back... Honza -- Jan Kara SUSE Labs, CR