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Howlett" , Lorenzo Stoakes , Vlastimil Babka , Jann Horn , "xe-linux-external(mailer list)" , "linux-kernel@vger.kernel.org" , "linux-trace-kernel@vger.kernel.org" , "linux-perf-users@vger.kernel.org" , "linux-mm@kvack.org" Subject: Re: [PATCH] mm/madvise: preserve uprobe breakpoints across MADV_DONTNEED Message-ID: References: <20260429131522.4049054-1-dtominac@cisco.com> <889e4186-9f75-45d3-bd9a-1c90b218a635@kernel.org> MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 X-Mimecast-MFC-PROC-ID: GUa-OPaUki_3gfeVIhQWt-bQ6e0ZSuEIYuxVXYGQYqo_1777540621 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Stat-Signature: feo9sowe3p8a4hrn9gch7rw9x1dxqxir X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 6F770140002 X-Rspam-User: X-HE-Tag: 1777540628-588893 X-HE-Meta: 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 dWKgC+2S tkuIxbfBxVhm/fuSz45lyj97Tf3cz9pvU6yCGpEbO/i+L5X08T26ObGIqLwC2aZIG7+f9j29lR6+JzmRNRadbzqD+9RMTC0l1YMujvD2qpyckHietsKHGwttsKk4fUSPjyuywSmTNygKaClKgRoTas6CAfSZPyZbhzrL3MnqWhZr3fCgNlgvU5rnHdzU/Z+zONK/AyNMvje0KWw8BthVGc3+qK8bdpBb1BBAiFfYDm8+CF3KUQS2lsZmuzJN1McwZ1Ahtdb6SEpkworDsj/7QJlVPd5cSZibN+yUNZO09y4AlGVJEXC3NZ5YleJKoRRRFoZW30LwdqZ9bivoN4dl11TBnvPCDdJMBi8XXNHTzTlj9fisOoLg3dWoIT/MWJQ9KFwBgJV/iZFPvDk3tRFShNUpgveA/QntSbYBCpFpNtcWSilsm0NDVSzsr9dzUGSmYxR11 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 04/29, Daniel Walker (danielwa) wrote: > > Shouldn't there be some sort of compensation or notification for this, or is each person that > hits this suppose to just scratch their head and send a patch that's rejected? Not sure... uprobes assumes that it owns the modified page and nobody can modify/unmap it, including the probed application or debugger. But may be MADV_DONTNEED should not set zap_details.even_cows == true by default ? Oleg.