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Fri, 21 Jul 2023 07:50:09 -0700 (PDT) MIME-Version: 1.0 References: <20230713101415.108875-6-usama.anjum@collabora.com> In-Reply-To: From: Andrei Vagin Date: Fri, 21 Jul 2023 07:49:58 -0700 Message-ID: Subject: Re: fs/proc/task_mmu: Implement IOCTL for efficient page table scanning To: Muhammad Usama Anjum Cc: =?UTF-8?B?TWljaGHFgiBNaXJvc8WCYXc=?= , Danylo Mocherniuk , Alex Sierra , Alexander Viro , Andrew Morton , Axel Rasmussen , Christian Brauner , Cyrill Gorcunov , Dan Williams , David Hildenbrand , Greg KH , "Gustavo A . R . Silva" , "Liam R . Howlett" , Matthew Wilcox , =?UTF-8?B?TWljaGHFgiBNaXJvc8WCYXc=?= , Mike Rapoport , Nadav Amit , Pasha Tatashin , Paul Gofman , Peter Xu , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , Yang Shi , Yun Zhou , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, kernel@collabora.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 5A8EBC000B X-Stat-Signature: uery5kth6ah9nhujgm63raszpjyrytcx X-HE-Tag: 1689951010-31177 X-HE-Meta: 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 xrYnWu3j 7LcrszrzcpUkYeFxjVXLSnE7Vu3kqn05/868WrTKXB0cviPf6l4+8BGZMCsQoZAfuj9i9+f9AKh1/3Tj5AtHQP/bw862yd2PvvDqdRzsLfCspQ46wyXjvyORG4ogCYL/o/rSJXjRDIYaRmOpfGtdA988PxmtMrLOeUrCZTTUrT2E0KLbswfAI6N+boc2u2vzqHNG1Tln6W1HLP2O8HyFgiCD8q0VATWVaeLRbS/4DJ7T3IqtOu2jGczEymvlIxQCuAT2H7XSC1JfG3M8SPq8ZgOVm+dy/Ug9vPD648Mz96Y5nEzC4BcRT1gU5DMnidBlaaXbH9WoEPvueqT+NeUOOYTWbKTrjeGE7EqoFEOHjxuVt6PUY/s3zVaQsYWwapw5PSQik2Hlj73V6mQVYWeHfNvGYXg64x64Bv357HyWqqRCztD5n7+3vdOSpkmguGm3Bem3jBXaXdD4yzXE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Jul 20, 2023 at 9:27=E2=80=AFPM Muhammad Usama Anjum wrote: > > Thank you Micha=C5=82. > > On 7/21/23 12:28=E2=80=AFAM, Micha=C5=82 Miros=C5=82aw wrote: > > b. rename match "flags" to 'page categories' everywhere - this makes > > it easier to differentiate the ioctl()s categorisation of pages > > from struct page flags; > > c. change {required + excluded} to {inverted + required}. This was > > rejected before, but I'd like to illustrate the difference. > > Old interface can be translated to the new by: > > categories_inverted =3D excluded_mask > > categories_mask =3D required_mask | excluded_mask > > categories_anyof_mask =3D anyof_mask > > The new way allows filtering by: A & (B | !C) > > categories_inverted =3D C > > categories_mask =3D A > > categories_anyof_mask =3D B | C > Andrei and Danylo, > > Are you okay with these masks? It were you two who had proposed these. I am okay. > > > -- > BR, > Muhammad Usama Anjum