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

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Message-ID: <04e76ff6-3cc0-4ad3-a39b-1f39107e5f3f@collabora.com>
Date:   Fri, 21 Jul 2023 22:51:44 +0500
From:   Muhammad Usama Anjum <usama.anjum@...labora.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Andrei Vagin <avagin@...il.com>,
        Danylo Mocherniuk <mdanylo@...gle.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

On 7/21/23 4:29 PM, Michał Mirosław wrote:
> On Fri, Jul 21, 2023 at 03:48:22PM +0500, Muhammad Usama Anjum wrote:
>> On 7/21/23 12:28 AM, Michał Mirosław wrote:
>>> This is a massaged version of patch by Muhammad Usama Anjum [1]
>>> to illustrate my review comments and hopefully push the implementation
>>> efforts closer to conclusion. The changes are:
>> Thank you so much for this effort. I also want to reach conclusion. I'll
>> agree with all the changes which don't affect me. But some requirements
>> aren't being fulfilled with this current design.
> [...]
>> #define PAGE_IS_WPASYNC		(1 << 0)
>> #define PAGE_IS_WRITTEN		(1 << 1)
>> You have another new flag PAGE_IS_WPASYNC. But there is no application of
>> PAGE_IS_WPASYNC. We must not add a flag which don't have any user.
> 
> BTW, I'm not sure I got the PAGE_IS_WPASYNC naming right - this is to
> designate pages that can be write-protected (are UFFD-registered I believe).
PAGE_IS_UFFDWP_REGISTERED or PAGE_IS_WP_REG?

> 
> Best Regards
> Michał Mirosław

-- 
BR,
Muhammad Usama Anjum