linux-kernel - Re: [PATCH v26 2/5] fs/proc/task_mmu: Implement IOCTL to get and optionally clear info about PTEs

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Message-ID: <CABb0KFFphs6gLCH9+tenmoJ_3nNAop30pOMhKDwKT2Pthvb=6g@mail.gmail.com>
Date:   Thu, 27 Jul 2023 13:46:55 +0200
From:   Michał Mirosław <emmir@...gle.com>
To:     Muhammad Usama Anjum <usama.anjum@...labora.com>
Cc:     Peter Xu <peterx@...hat.com>, David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrei Vagin <avagin@...il.com>,
        Danylo Mocherniuk <mdanylo@...gle.com>,
        Paul Gofman <pgofman@...eweavers.com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Mike Rapoport <rppt@...nel.org>, Nadav Amit <namit@...are.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Shuah Khan <shuah@...nel.org>,
        Christian Brauner <brauner@...nel.org>,
        Yang Shi <shy828301@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Yun Zhou <yun.zhou@...driver.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Alex Sierra <alex.sierra@....com>,
        Matthew Wilcox <willy@...radead.org>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        Greg KH <gregkh@...uxfoundation.org>, kernel@...labora.com,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>
Subject: Re: [PATCH v26 2/5] fs/proc/task_mmu: Implement IOCTL to get and
 optionally clear info about PTEs

On Thu, 27 Jul 2023 at 11:37, Muhammad Usama Anjum
<usama.anjum@...labora.com> wrote:
[...]
> --- a/include/uapi/linux/fs.h
> +++ b/include/uapi/linux/fs.h
[...]
> +/*
> + * struct pm_scan_arg - Pagemap ioctl argument
> + * @size:              Size of the structure
> + * @flags:             Flags for the IOCTL
> + * @start:             Starting address of the region
> + * @end:               Ending address of the region
> + * @walk_end:          Ending address of the visited memory is returned
> + *                     (This helps if entire range hasn't been visited)

"Address where the scan stopped (written by kernel). walk_end == end
informs that the scan completed."

(To make the userspace life easier, we can copy `end` (only) in case
of full scan completion, so that the tag is retained.)

> + * @vec:               Address of page_region struct array for output
> + * @vec_len:           Length of the page_region struct array
> + * @max_pages:         Optional limit for number of returned pages (0 = disabled)
> + * @category_inverted: PAGE_IS_* categories which values match if 0 instead of 1
> + * @category_mask:     Skip pages for which any category doesn't match
> + * @category_anyof_mask: Skip pages for which no category matches
> + * @return_mask:       PAGE_IS_* categories that are to be reported in `page_region`s returned
> + */