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Sun, 23 Aug 2026 15:49:43 -0400 (EDT) Date: Sun, 23 Aug 2026 20:49:42 +0100 From: Kiryl Shutsemau To: Mike Rapoport 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, ryan.roberts@arm.com, shuah@kernel.org, surenb@google.com, usama.arif@linux.dev, vbabka@kernel.org, ziy@nvidia.com, usama.anjum@arm.com, agordeev@linux.ibm.com, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v4 05/19] selftests/mm: make the swap cases' swapout reliable Message-ID: References: <20260815015901.1236937-1-kirill@shutemov.name> <20260815015901.1236937-6-kirill@shutemov.name> <178721523516.2799959.17614116166980239496.b4-review@b4> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <178721523516.2799959.17614116166980239496.b4-review@b4> X-Rspamd-Queue-Id: E575B40003 X-Rspam-User: X-Stat-Signature: 5cbdrseq8dep4a561j8t1tjee4unmnrb X-Rspamd-Server: rspam06 X-HE-Tag: 1787514586-875963 X-HE-Meta: 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 cEG+zhi7 LDyzeWiiZqiSIciQgLPb/ks3jHKdiVDhQPxtGYe4qlff8azCdl9Z9ccDzrO2jrH17oMxmL1gvvilkFkv4irXz2+cLviybyUOcWR5RGxzLQpabN9cLJpuTfJnXwglrtpL8xHwnKS74e0lDBQLFR8tQB1sJneN6sNpwN6vMMr2CEUPbSGjPhN8mf/ro/5kT4Bqtrww9nGwAb6rWNhfiAW4eT5k3Wp84XeEz2wLzDgjR9QK6a0t1KEyKPIBWu03PiAYwIvOyVKwTHE+DM998I50D5ROwYOPq1QDgcEzqVmr7xIkH6iY4uLH2js0sE6pMMHOVWq2RRyQ7UgUjxPQz1/xkH0J6O1WqC2qbUNQ9/wmEljC6qzE92h+CbGciLantBYes5CkX70on+X26Er/x0qw5IAb/RnD4VywbNOaRbM6RcKPDxU7ojDeoujR2BIdNFHlPlJMQ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Aug 20, 2026 at 11:40:35AM +0300, Mike Rapoport wrote: > > Ask again for up to two seconds, with the range held out of the daemon's > > reach while asking. The collapse each case runs next puts MADV_HUGEPAGE > > back, so only the setup is affected. > > "Retry several times for up to two seconds meanwhile holding the range > out of the khugepaged reach. The collapse each case runs next restores > MADV_NOHUGEPAGE, so only setup is affected" Small correction: it restores `MADV_HUGEPAGE` -- `wait_for_scan()` sets that before it waits. `MADV_NOHUGEPAGE` is what the setup puts down. Ack, for other input. -- Kiryl Shutsemau / Kirill A. Shutemov