linux-kernel - Re: fs/proc/task_mmu: Implement IOCTL for efficient page table scanning

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Message-ID: <e430ea5c-fbf2-9e23-626d-2e6ea63eba18@collabora.com>
Date:   Fri, 21 Jul 2023 09:27:34 +0500
From:   Muhammad Usama Anjum <usama.anjum@...labora.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Andrei Vagin <avagin@...il.com>,
        Danylo Mocherniuk <mdanylo@...gle.com>
Cc:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Alex Sierra <alex.sierra@....com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Christian Brauner <brauner@...nel.org>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Michał Mirosław <emmir@...gle.com>,
        Mike Rapoport <rppt@...nel.org>, Nadav Amit <namit@...are.com>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Paul Gofman <pgofman@...eweavers.com>,
        Peter Xu <peterx@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Yang Shi <shy828301@...il.com>,
        Yun Zhou <yun.zhou@...driver.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        kernel@...labora.com
Subject: Re: fs/proc/task_mmu: Implement IOCTL for efficient page table
 scanning

Thank you Michał.

On 7/21/23 12:28 AM, Michał Mirosław 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 = excluded_mask
> 		categories_mask = required_mask | excluded_mask
> 		categories_anyof_mask = anyof_mask
> 	The new way allows filtering by: A & (B | !C)
> 		categories_inverted = C
> 		categories_mask = A
> 		categories_anyof_mask = B | C
Andrei and Danylo,

Are you okay with these masks? It were you two who had proposed these.


-- 
BR,
Muhammad Usama Anjum