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h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=sgeAvZuB1W6o1SdRy9zYA7GJMhndI73Mrx1OMrKc6iaKtu+wVbV9Et6vqsUoL4Ei2 AlUw7uMs0dDHZIdIf/qR4ykATw7Uhw9c56n8TDd7wKgyWoGwhTy0njvoz+x1s9NB8X vCST7KDRrGfaVAbHWEVbXIK7ptDuUgFZlv3Csl/g= Message-ID: Date: Mon, 19 Oct 2026 10:43:14 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 5/8] selftests/mm: check that MADV_COLD and MADV_PAGEOUT preserve shared memory To: "Gregory Price (Meta)" , linux-kselftest@vger.kernel.org, linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, shuah@kernel.org References: <20261014175756.2035176-1-gourry@gourry.net> <20261014175756.2035176-6-gourry@gourry.net> From: Sarthak Sharma Content-Language: en-US In-Reply-To: <20261014175756.2035176-6-gourry@gourry.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: qh8x1yd8htrabr3kiwtckt6m5fkpcz4f X-Rspamd-Queue-Id: 0B1C6180003 X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1792386801-928405 X-HE-Meta: U2FsdGVkX18pGfN6C8DtBATFLH2AMXuOAmopCAEYTzzk7ZfP7UIEWxjuiP3+QjPeIty1xz0Le1SDbvfFmZwUeh+nNhQQT73lS19Z8xOCTW8S662cqjP1ZzscBnzXyd/O5+qISBq0HRVsapCwpJRUF6H45yjaTz8yex492d+Z4e3FZ/QHmlSmr/HkWW0ASaV6qV9zIt+P/nAMey3w2/FxBOLdWSj0ICydE/wsJqCgg6UcbFIMYFO8/N9lumVTjZQjo9i5dA+T1dTY2Qwqha/VtLSULwcrW2b7FZ3sGuyHpcQ3ZMZDLWDfaUuYMK4FGbDsKTvSWp8uPa/3XNywVdqrwHLStFG0Ax21V/ztFYrlqncaAIFlMrz0K77NpxzrmluxF28m8DjNXPnBcTiVReq596FcJaMB3QzelXfnlP/mMEpFEzy5qxswswMCXN3AoKc5gQmPXuI+bp7aYwSJPTFD8zsK4l2CVT0PH6qnM8Ny/g1u0v2XR6lU52w5h56+dJnelqfQcT1MeDptl0WrGV67kk0zTMoZYUnNYgBlSqbnDSY/tEU/EG+7mU3NvEriKPw8yejKMy1mqDwWh2Gc4rQIQ66xLeRw+PbjRZlLAX72Nzc/R8aZ9uobcQOXLzSnA7iOJiIEe3A14/F66nX3zyNxXBf9y5E3Nd+nHh4T7/hzB7UrAkHuTNj4ODC2TS8Opix24GZkbY1pdf3kUOq8qvMuTtU9/agdHAWI3c7LKu1R5Ttw38M+sNYyH3jXbz7+6CAEp/3oxsYSSKW4my16KpeYq0bBjghqg2zKuCcA6swiQz7xZDoCkrCsIxLTv6iFgrdJWXZW1NFpbjdkJPwEebsIDUC0Rl2vHLTmYTiVaqnnOwx8d/Q2MxNUhh6/ZzwYVG34ZCgNARg6FY4y+ywp4dZs81yH7u6o3ATNW250eTK0351PC/JI9Cp6UO0EvDenSW2pO/grWqyYtQQYUYasrNu 02arHb0C OMxQYzwWl3FGAmKJMLkbJRaGeY+P63f4yAOWhjesY5/ZABtUR2gjoBsJjJDWhkVS5jL+O690X7kZridl9eMp7E8gZsBzN8KqW9d0KwT/LEla5pLe7qeRMaWTrJiz14t0RSXS6nXyUwLk9cIyXVS7sTPtv5aUIsf7MgdAh5XZCM0o6YCeavXlJ7EWxjKxblgIIBdPQvzdMohFMhzcEfwMKUWTvDZMmI/WnczkUTUUhw8nO5SqyOEklMP8y4gnIhLvN4rmdMMFyhwUdoDeEme+v60Yes/1xCdgoBQFruWCJNSU7lOP5csze1y0S9wMWLkqVCEE/lRYl8t2WWMzBR2qbHvH1x+cP9KhGbpoxpGagL2Nq7CQabtMT/4PuToaM65pk3UeHkI3Sb9hFHFN+thOSusiKIXcCWqm8KRVko6TDMluuXuw= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/14/26 11:27 PM, Gregory Price (Meta) wrote: > Both hints are non-destructive, but the tests so far only check that for > private anonymous memory. Shared memory reaches reclaim through different > paths: a dirty shared file page must be written back or left resident, > shared anonymous memory is paged out through shmem, and a SHM_LOCK'd > segment is unevictable without its VMA being VM_LOCKED. > > Check that MADV_COLD and MADV_PAGEOUT preserve a dirty shared file page, > that MADV_PAGEOUT preserves a shared anonymous page, and that it leaves a > SHM_LOCK'd page resident. The SHM_LOCK test needs root to confirm through > /proc/kpageflags that the page is unevictable, and skips if it is not. > > Signed-off-by: Gregory Price (Meta) > --- > tools/testing/selftests/mm/madvise.c | 138 +++++++++++++++++++++++++++ > tools/testing/selftests/mm/vm_util.h | 1 + > 2 files changed, 139 insertions(+) LGTM Reviewed-by: Sarthak Sharma