All of lore.kernel.org
 help / color / mirror / Atom feed
From: Nadav Amit <namit@vmware.com>
To: Peter Xu <peterx@redhat.com>
Cc: "Muhammad Usama Anjum" <usama.anjum@collabora.com>,
	"Mike Rapoport" <rppt@kernel.org>,
	"Michał Mirosław" <emmir@google.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Alexander Viro" <viro@zeniv.linux.org.uk>,
	"Cyrill Gorcunov" <gorcunov@gmail.com>,
	"Paul Gofman" <pgofman@codeweavers.com>,
	"Danylo Mocherniuk" <mdanylo@google.com>,
	"Shuah Khan" <shuah@kernel.org>,
	"Christian Brauner" <brauner@kernel.org>,
	"Yang Shi" <shy828301@gmail.com>,
	"Vlastimil Babka" <vbabka@suse.cz>,
	"Liam R . Howlett" <Liam.Howlett@oracle.com>,
	"Yun Zhou" <yun.zhou@windriver.com>,
	"Suren Baghdasaryan" <surenb@google.com>,
	"Alex Sierra" <alex.sierra@amd.com>,
	"Matthew Wilcox" <willy@infradead.org>,
	"Pasha Tatashin" <pasha.tatashin@soleen.com>,
	"Axel Rasmussen" <axelrasmussen@google.com>,
	"Gustavo A . R . Silva" <gustavoars@kernel.org>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"kernel list" <linux-kernel@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	linux-mm <linux-mm@kvack.org>,
	linux-kselftest <linux-kselftest@vger.kernel.org>,
	"Greg KH" <gregkh@linuxfoundation.org>,
	"kernel@collabora.com" <kernel@collabora.com>,
	"David Hildenbrand" <david@redhat.com>,
	"Andrei Vagin" <avagin@gmail.com>
Subject: Re: [PATCH v10 3/6] fs/proc/task_mmu: Implement IOCTL to get and/or the clear info about PTEs
Date: Wed, 1 Mar 2023 01:59:47 +0000	[thread overview]
Message-ID: <99887AA3-8023-4462-A870-995A47383175@vmware.com> (raw)
In-Reply-To: <Y/5WjdXJ+56Kud3u@x1n>



> On Feb 28, 2023, at 11:31 AM, Peter Xu <peterx@redhat.com> wrote:
> 
>> Anyhow, thanks for all the explanations. Eventually, I understand that
>> using bitmaps can be more efficient than a log if the bits are condensed.
> 
> Note that I think what Muhammad (sorry, Muhammad! I think I spelled your
> name wrongly before starting from some email..) proposed is not a bitmap,
> but an array of ranges that can coalesce the result into very condensed
> form.  Pros and cons.
> 
> Again, I can't comment much on that API, but since there're a bunch of
> other developers looking at that and they're also potential future users,
> I'll trust their judgement and just focus more on the other side of things.


Thanks Peter for your patience.

I would just note that I understood that Muhammad did not propose a condensed
bitmap, and that was a hint that handling a condensed bitmap (at least on x86)
can be done rather efficiently. I am not sure about other representations.

Thanks for your explanations again, Peter.

  reply	other threads:[~2023-03-01  2:00 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-02 11:29 [PATCH v10 0/6] Implement IOCTL to get and/or the clear info about PTEs Muhammad Usama Anjum
2023-02-02 11:29 ` [PATCH v10 1/6] userfaultfd: Add UFFD WP Async support Muhammad Usama Anjum
2023-02-08 21:12   ` Peter Xu
2023-02-09 15:27     ` Muhammad Usama Anjum
2023-02-17  9:37   ` Mike Rapoport
2023-02-20  8:36     ` Muhammad Usama Anjum
2023-02-02 11:29 ` [PATCH v10 2/6] userfaultfd: update documentation to describe UFFD_FEATURE_WP_ASYNC Muhammad Usama Anjum
2023-02-08 21:31   ` Peter Xu
2023-02-09 15:47     ` Muhammad Usama Anjum
2023-02-02 11:29 ` [PATCH v10 3/6] fs/proc/task_mmu: Implement IOCTL to get and/or the clear info about PTEs Muhammad Usama Anjum
2023-02-08 22:15   ` Peter Xu
2023-02-13 12:55     ` Muhammad Usama Anjum
2023-02-13 21:42       ` Peter Xu
2023-02-14  7:57         ` Muhammad Usama Anjum
2023-02-14 20:59           ` Peter Xu
2023-02-15 10:03             ` Muhammad Usama Anjum
2023-02-15 21:12               ` Peter Xu
2023-02-17 10:39                 ` Muhammad Usama Anjum
2023-02-08 22:22   ` Cyrill Gorcunov
2023-02-13  8:19     ` Muhammad Usama Anjum
2023-02-17 10:10   ` Mike Rapoport
2023-02-20 10:38     ` Muhammad Usama Anjum
2023-02-20 11:38       ` Muhammad Usama Anjum
2023-02-20 13:17         ` Mike Rapoport
2023-02-17 15:18   ` Michał Mirosław
2023-02-21 10:28     ` Muhammad Usama Anjum
2023-02-21 12:42       ` Michał Mirosław
2023-02-22 10:11         ` Muhammad Usama Anjum
2023-02-22 10:44           ` Michał Mirosław
2023-02-22 11:06             ` Muhammad Usama Anjum
2023-02-22 11:48               ` Michał Mirosław
2023-02-23  6:44                 ` Muhammad Usama Anjum
2023-02-23  8:41                   ` Michał Mirosław
2023-02-23  9:23                     ` Muhammad Usama Anjum
2023-02-23  9:42                       ` Michał Mirosław
2023-02-24  2:20         ` Andrei Vagin
2023-02-25  9:38           ` Michał Mirosław
2023-02-19 13:52   ` Nadav Amit
2023-02-20 13:24     ` Muhammad Usama Anjum
2023-02-22 19:10       ` Nadav Amit
2023-02-23  7:10         ` Muhammad Usama Anjum
2023-02-23 17:11           ` Nadav Amit
2023-02-27 21:18             ` Peter Xu
2023-02-27 23:09               ` Nadav Amit
2023-02-28 15:55                 ` Peter Xu
2023-02-28 17:21                   ` Nadav Amit
2023-02-28 19:31                     ` Peter Xu
2023-03-01  1:59                       ` Nadav Amit [this message]
2023-02-20 13:26   ` Mike Rapoport
2023-02-21  7:02     ` Muhammad Usama Anjum
2023-02-02 11:29 ` [PATCH v10 4/6] tools headers UAPI: Update linux/fs.h with the kernel sources Muhammad Usama Anjum
2023-02-02 11:29 ` [PATCH v10 5/6] mm/pagemap: add documentation of PAGEMAP_SCAN IOCTL Muhammad Usama Anjum
2023-02-09 19:26   ` Peter Xu
2023-02-13 10:44     ` Muhammad Usama Anjum
2023-02-02 11:29 ` [PATCH v10 6/6] selftests: vm: add pagemap ioctl tests Muhammad Usama Anjum

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=99887AA3-8023-4462-A870-995A47383175@vmware.com \
    --to=namit@vmware.com \
    --cc=Liam.Howlett@oracle.com \
    --cc=akpm@linux-foundation.org \
    --cc=alex.sierra@amd.com \
    --cc=avagin@gmail.com \
    --cc=axelrasmussen@google.com \
    --cc=brauner@kernel.org \
    --cc=dan.j.williams@intel.com \
    --cc=david@redhat.com \
    --cc=emmir@google.com \
    --cc=gorcunov@gmail.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=gustavoars@kernel.org \
    --cc=kernel@collabora.com \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-kselftest@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=mdanylo@google.com \
    --cc=pasha.tatashin@soleen.com \
    --cc=peterx@redhat.com \
    --cc=pgofman@codeweavers.com \
    --cc=rppt@kernel.org \
    --cc=shuah@kernel.org \
    --cc=shy828301@gmail.com \
    --cc=surenb@google.com \
    --cc=usama.anjum@collabora.com \
    --cc=vbabka@suse.cz \
    --cc=viro@zeniv.linux.org.uk \
    --cc=willy@infradead.org \
    --cc=yun.zhou@windriver.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.