From: Michal Hocko <mhocko@kernel.org>
To: Michel Lespinasse <walken@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Laurent Dufour <ldufour@linux.ibm.com>,
Vlastimil Babka <vbabka@suse.cz>,
Matthew Wilcox <willy@infradead.org>,
Liam Howlett <Liam.Howlett@oracle.com>,
Jerome Glisse <jglisse@redhat.com>,
Davidlohr Bueso <dave@stgolabs.net>,
David Rientjes <rientjes@google.com>,
Hugh Dickins <hughd@google.com>, Ying Han <yinghan@google.com>,
Jason Gunthorpe <jgg@ziepe.ca>,
Daniel Jordan <daniel.m.jordan@oracle.com>,
John Hubbard <jhubbard@nvidia.com>
Subject: Re: [PATCH v6 00/12] Add a new mmap locking API wrapping mmap_sem calls
Date: Tue, 9 Jun 2020 14:03:28 +0200 [thread overview]
Message-ID: <20200609120328.GB22623@dhcp22.suse.cz> (raw)
In-Reply-To: <20200520052908.204642-1-walken@google.com>
Hi,
On Tue 19-05-20 22:28:56, Michel Lespinasse wrote:
> Reposting this patch series on top of v5.7-rc6. I think this is ready
> for inclusion into the -mm tree; however there were some minor points
> of feedback to address and also it was easier to regenerate a full
> version after the v5.5 (only updating patches 09/10 and 10/10) caused
> some confusion.
>
>
> This patch series adds a new mmap locking API replacing the existing
> mmap_sem lock and unlocks. Initially the API is just implemente in terms
> of inlined rwsem calls, so it doesn't provide any new functionality.
>
> There are two justifications for the new API:
>
> - At first, it provides an easy hooking point to instrument mmap_sem
> locking latencies independently of any other rwsems.
>
> - In the future, it may be a starting point for replacing the rwsem
> implementation with a different one, such as range locks. This is
> something that is being explored, even though there is no wide concensus
> about this possible direction yet.
> (see https://patchwork.kernel.org/cover/11401483/)
Sorry that I am jumping late to the game.
Even though I hoped that the new API would somehow start using a
concept of address ranges, because I believe this is a fundamental lock
granularity for this mmap_sem, this is definitely a step in the right
direction. Getting rid of all direct usage of mmap_sem is an
improvement in itself.
Feel free to add
Acked-by: Michal Hocko <mhocko@suse.com>
Thanks!
--
Michal Hocko
SUSE Labs
prev parent reply other threads:[~2020-06-09 12:03 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-20 5:28 [PATCH v6 00/12] Add a new mmap locking API wrapping mmap_sem calls Michel Lespinasse
2020-05-20 5:28 ` [PATCH v6 01/12] mmap locking API: initial implementation as rwsem wrappers Michel Lespinasse
2020-05-20 5:28 ` [PATCH v6 02/12] MMU notifier: use the new mmap locking API Michel Lespinasse
2020-05-20 5:28 ` [PATCH v6 03/12] DMA reservations: " Michel Lespinasse
2020-05-20 5:29 ` [PATCH v6 04/12] mmap locking API: use coccinelle to convert mmap_sem rwsem call sites Michel Lespinasse
2020-05-20 5:29 ` [PATCH v6 05/12] mmap locking API: convert mmap_sem call sites missed by coccinelle Michel Lespinasse
2020-05-21 3:23 ` Andrew Morton
2020-05-21 4:49 ` Michel Lespinasse
2020-05-20 5:29 ` [PATCH v6 06/12] mmap locking API: convert nested write lock sites Michel Lespinasse
2020-05-20 5:29 ` [PATCH v6 07/12] mmap locking API: add mmap_read_trylock_non_owner() Michel Lespinasse
2020-05-22 14:15 ` Davidlohr Bueso
2020-05-20 5:29 ` [PATCH v6 08/12] mmap locking API: add MMAP_LOCK_INITIALIZER Michel Lespinasse
2020-05-29 20:17 ` Daniel Jordan
2020-05-20 5:29 ` [PATCH v6 09/12] mmap locking API: add mmap_assert_locked() and mmap_assert_write_locked() Michel Lespinasse
2020-05-21 7:35 ` Vlastimil Babka
2020-05-29 20:36 ` Daniel Jordan
2020-05-20 5:29 ` [PATCH v6 10/12] mmap locking API: rename mmap_sem to mmap_lock Michel Lespinasse
2020-05-22 14:16 ` Davidlohr Bueso
2020-05-29 20:42 ` Daniel Jordan
2020-05-20 5:29 ` [PATCH v6 11/12] mmap locking API: convert mmap_sem API comments Michel Lespinasse
2020-05-21 7:38 ` Vlastimil Babka
2020-05-22 14:13 ` Davidlohr Bueso
2020-05-29 20:50 ` Daniel Jordan
2020-05-20 5:29 ` [PATCH v6 12/12] mmap locking API: convert mmap_sem comments Michel Lespinasse
2020-05-21 3:22 ` Andrew Morton
2020-05-21 4:51 ` Michel Lespinasse
2020-05-21 7:41 ` Vlastimil Babka
2020-05-21 7:50 ` Michel Lespinasse
2020-05-21 17:25 ` Andrew Morton
2020-05-22 14:21 ` Vlastimil Babka
2020-05-29 21:16 ` Daniel Jordan
2020-06-09 12:03 ` Michal Hocko [this message]
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=20200609120328.GB22623@dhcp22.suse.cz \
--to=mhocko@kernel.org \
--cc=Liam.Howlett@oracle.com \
--cc=akpm@linux-foundation.org \
--cc=daniel.m.jordan@oracle.com \
--cc=dave@stgolabs.net \
--cc=hughd@google.com \
--cc=jgg@ziepe.ca \
--cc=jglisse@redhat.com \
--cc=jhubbard@nvidia.com \
--cc=ldufour@linux.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=peterz@infradead.org \
--cc=rientjes@google.com \
--cc=vbabka@suse.cz \
--cc=walken@google.com \
--cc=willy@infradead.org \
--cc=yinghan@google.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).