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[80.230.68.31]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47aa0f2186bsm14266295f8f.36.2026.07.05.01.42.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 05 Jul 2026 01:42:41 -0700 (PDT) Date: Sun, 5 Jul 2026 04:42:38 -0400 From: "Michael S. Tsirkin" To: Andrew Morton 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: <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> MIME-Version: 1.0 In-Reply-To: <20260705013956.36f649b5cb13409d9088838a@linux-foundation.org> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: Oaluqed_kM5-mx2mA-ikgae3YcHpdjqwuwyrPWhQoMA_1783240963 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 3B4542000E X-Stat-Signature: y3hkaxgqnnxtsfojmzpdcuqo8rhyfui7 X-HE-Tag: 1783240966-901610 X-HE-Meta: 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 QYtN0gD3 hORhJBuxMkMmU/laMm4BVqm/8hGp3/i/MkKf2nxYW/I/pxlawnhlXlUTHYwXUnk/EuadPGZQBG63skKELT4U4CIpihP9KeGd7kezC/tReE3GIsYdoHSqM41Gn0mTT+ZqQ8zhi/mmYojS+FS9bQidtvS4YiMtVKLoFypQ7Bz+0AIQcfxaYlgyMyMSXw8oIfJsshMw8rZZEVqPqdwZ76VKLKTWXz8PsY5d0vdopaNiJznos/UAi6RKNSXLG6tPMcV/tasK542IO/5wSIZ1l6PnK0wqrfrW4O4SGqp8NL1xnsCxBOQ1Q8Elr5Xnx4HtM6dQJSAJaf9hpurdomUZAXSdbssyPUUIU1y+JnfEbPJxArJOGt8c= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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. -- MST