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Tue, 11 Aug 2026 12:58:49 -0400 (EDT) Date: Tue, 11 Aug 2026 17:58:48 +0100 From: Kiryl Shutsemau To: Alexander Gordeev Cc: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, nico.pache@linux.dev, baolin.wang@linux.alibaba.com, baohua@kernel.org, dev.jain@arm.com, hughd@google.com, lance.yang@linux.dev, liam@infradead.org, mhocko@suse.com, rppt@kernel.org, ryan.roberts@arm.com, shuah@kernel.org, surenb@google.com, usama.arif@linux.dev, vbabka@kernel.org, ziy@nvidia.com, usama.anjum@arm.com, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 00/17] selftests/mm: improve khugepaged coverage Message-ID: References: <20260807113647.3744609-1-kirill@shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Stat-Signature: utbpteo98m8xypxckq6bhz3ydsxc994t X-Rspamd-Queue-Id: E44D740014 X-Rspamd-Server: rspam03 X-Rspam-User: X-HE-Tag: 1786467531-564452 X-HE-Meta: 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 TNKGmL41 aBRdDBgdTgKqXOvCk7y34z/bUqCcGVAz95w452EyUH9MFzdPHJah26w3lt4acS6ckFVSzr0Kc+K411QCiRkYcpqcmSuXyAlrHhXu4nRgWSmLDJAHHhs2MN6hwpbptIcotrbW5WcRoPCswolP90pn6H9uVZqTtoy4bAKvVZKPFXi+sgeiU4SFRBfktz6s1/17hfy3/VjdwmKitAydkDYUs4oQywSTffsvIOV3O0In2Na8dbNUb7Nb1kQwQzHpHPG2kz6sP8O9aOHIvIiw61uOdBsKpfBlLTUwcQTgB9nGeET4NssrzSgaN6Lkv2xntRC4MsVrh1U9YtoJX6pOQqbsiwgh6XVlCZolqF+n6XrkTmL1cPzFaC0IRdEgVef/EixNl0CCwFoDCtm46Fxgj2vszCazjqCT6ClnkpiSF3BqODiSJ50ndbglEF7qYL+wR+PKKbsxG Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Aug 10, 2026 at 02:58:43PM +0200, Alexander Gordeev wrote: > On Fri, Aug 07, 2026 at 12:36:30PM +0100, Kiryl Shutsemau wrote: > > Hi Kiryl, > > ... > > - Dropped the swap-skip patch, an equivalent has landed > > (Alexander Gordeev). > > And dropped [1] following David feedback [2]. Would you pursue the proper fix? Yes. v3 will handle the failure rather than predict it. is_swap_enabled() already skips these cases when no swap is active, so what is left is swap that exists but cannot take what the case asks for. The series already has swapout_range(), which reissues MADV_PAGEOUT for up to two seconds and reports whether the count arrived; I will make the two cases skip when it does not. That covers swap too small, swap full, a memcg limit and a folio still under writeback, without reading /proc/meminfo for any of them. An error from madvise() itself stays a hard failure -- that is the kernel refusing, not the machine being short of swap. -- Kiryl Shutsemau / Kirill A. Shutemov