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Tsirkin" Cc: linux-kernel@vger.kernel.org, "David Hildenbrand (Arm)" , Gregory Price , Zi Yan , Pankaj Gupta , Jason Wang , Xuan Zhuo , Eugenio =?ISO-8859-1?Q?P=E9rez?= , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Alexander Duyck , virtualization@lists.linux.dev, linux-mm@kvack.org Subject: Re: [PATCH v3] mm: page_reporting: allow driver to set batch capacity Message-Id: <20260705015116.bdf3335e9a955f057a6d9c5d@linux-foundation.org> In-Reply-To: <20260705044139-mutt-send-email-mst@kernel.org> References: <444c24cf39f3f3620fc90ef4695bd6b0979f4c4b.1783232420.git.mst@redhat.com> <20260705011635.9974cac7f0defec9961e85c4@linux-foundation.org> <20260705042313-mutt-send-email-mst@kernel.org> <20260705013956.36f649b5cb13409d9088838a@linux-foundation.org> <20260705044139-mutt-send-email-mst@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-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: C8F7C80007 X-Stat-Signature: 9mdpr1uiz6zbchnq9n37te1xznybbitc X-HE-Tag: 1783241478-99123 X-HE-Meta: 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 1oGGrdkv +xRyEO5iIuyjRmKBg/FDBsRdek0eLjc0y2JVFclo9S8ycBBc0LTdv8zi0Lee9Tro/ETbF+TZuPJFjF+WGlxTCP2Hbh2ul1OzF4CCQekn/vTl1ZvqhQU72y3FRX5zzshuZ8Ixsq4Tdez13VU+sbuDQlq4TvzZash9LSTjMhLv0EVddNVDMmitr0yknTh4Pt1UMjojI2f4mTtvjnRcEjNjSac6OSdwQZhhHr7gk/9SwKScRp6UsVkGe7U6/YovbSfuhl1C1Jj7sjl9sb5VxyYsx8xcHtOnpgwtuF9NhFr5bT1njK2k6uS9Jx+utFOC7LrkmJ2ku Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sun, 5 Jul 2026 04:42:38 -0400 "Michael S. Tsirkin" wrote: > On Sun, Jul 05, 2026 at 01:39:56AM -0700, Andrew Morton wrote: > > On Sun, 5 Jul 2026 04:25:53 -0400 "Michael S. Tsirkin" wrote: > > > > > > > If capacity is 0 or exceeds PAGE_REPORTING_CAPACITY, it defaults > > > > > to PAGE_REPORTING_CAPACITY. The 0 check and the clamping is done in > > > > > page_reporting_register(), before the reporting work is scheduled, > > > > > so we never get division by 0. > > > > > > > > Thanks. What's the priority here? Should we fix 7.2? Earlier? > > > > > > If possible, I'd like it in 7.2, have a setup like this (small > > > queue is useful for perf testing). > > > It's very early in the cycle and the code seems straight forward... > > > I judge the chances of breaking anything is tiny because > > > it just failed probe previously. > > > > No probs, I moved this to the the mm-hotfixes-unstable queue. No cc:stable. > > I suspect the Fixes tag will make their AI pick it anyway. But hey. -stable maintainers have been asked not to do that - only backport patches which have an explicit cc:stable. So should I add one?