From: Michal Hocko <mhocko@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>,
David Rientjes <rientjes@google.com>,
Mel Gorman <mgorman@suse.de>,
Johannes Weiner <hannes@cmpxchg.org>,
Al Viro <viro@zeniv.linux.org.uk>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Anatoly Stepanov <astepanov@cloudlinux.com>,
Andreas Dilger <adilger@dilger.ca>,
Andreas Dilger <andreas.dilger@intel.com>,
Anton Vorontsov <anton@enomsg.org>,
Ben Skeggs <bskeggs@redhat.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Colin Cross <ccross@android.com>,
Dan Williams <dan.j.williams@intel.com>,
David Sterba <dsterba@suse.com>,
Eric Dumazet <edumazet@google.com>,
Eric Dumazet <eric.dumazet@gmail.com>,
Hariprasad S <hariprasad@chelsio.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
Ilya Dryomov <idryomov@gmail.com>,
Kees Cook <keescook@chromium.org>,
Kent Overstreet <kent.overstreet@gmail.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Mike Snitzer <snitzer@redhat.com>,
Oleg Drokin <oleg.drokin@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Santosh Raspatur <santosh@chelsio.com>,
Tariq Toukan <tariqt@mellanox.com>,
"Theodore Ts'o" <tytso@mit.edu>,
Tom Herbert <tom@herbertland.com>,
Tony Luck <tony.luck@intel.com>, "Yan, Zheng" <zyan@redhat.com>,
Yishai Hadas <yishaih@mellanox.com>
Subject: Re: [PATCH 0/6 v3] kvmalloc
Date: Tue, 24 Jan 2017 16:17:52 +0100 [thread overview]
Message-ID: <20170124151752.GO6867@dhcp22.suse.cz> (raw)
In-Reply-To: <20170112153717.28943-1-mhocko@kernel.org>
On Thu 12-01-17 16:37:11, Michal Hocko wrote:
> Hi,
> this has been previously posted as a single patch [1] but later on more
> built on top. It turned out that there are users who would like to have
> __GFP_REPEAT semantic. This is currently implemented for costly >64B
> requests. Doing the same for smaller requests would require to redefine
> __GFP_REPEAT semantic in the page allocator which is out of scope of
> this series.
>
> There are many open coded kmalloc with vmalloc fallback instances in
> the tree. Most of them are not careful enough or simply do not care
> about the underlying semantic of the kmalloc/page allocator which means
> that a) some vmalloc fallbacks are basically unreachable because the
> kmalloc part will keep retrying until it succeeds b) the page allocator
> can invoke a really disruptive steps like the OOM killer to move forward
> which doesn't sound appropriate when we consider that the vmalloc
> fallback is available.
>
> As it can be seen implementing kvmalloc requires quite an intimate
> knowledge if the page allocator and the memory reclaim internals which
> strongly suggests that a helper should be implemented in the memory
> subsystem proper.
>
> Most callers I could find have been converted to use the helper instead.
> This is patch 5. There are some more relying on __GFP_REPEAT in the
> networking stack which I have converted as well but considering we do
> not have a support for __GFP_REPEAT for requests smaller than 64kB I
> have marked it RFC.
Are there any more comments? I would really appreciate to hear from
networking folks before I resubmit the series.
Thanks!
> [1] http://lkml.kernel.org/r/20170102133700.1734-1-mhocko@kernel.org
>
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2017-01-24 15:18 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-12 15:37 [PATCH 0/6 v3] kvmalloc Michal Hocko
2017-01-12 15:37 ` [PATCH 1/6] mm: introduce kv[mz]alloc helpers Michal Hocko
2017-01-16 4:34 ` John Hubbard
2017-01-16 8:47 ` Michal Hocko
2017-01-16 19:09 ` John Hubbard
2017-01-16 19:40 ` Michal Hocko
2017-01-16 21:15 ` John Hubbard
2017-01-16 21:48 ` Michal Hocko
2017-01-16 21:57 ` John Hubbard
2017-01-17 7:51 ` Michal Hocko
2017-01-18 5:59 ` John Hubbard
2017-01-18 8:21 ` Michal Hocko
2017-01-19 8:37 ` John Hubbard
2017-01-19 8:45 ` Michal Hocko
2017-01-19 9:09 ` John Hubbard
2017-01-19 9:56 ` Michal Hocko
2017-01-19 21:28 ` John Hubbard
2017-01-26 12:09 ` Michal Hocko
2017-01-30 8:42 ` Vlastimil Babka
2017-01-12 15:37 ` [PATCH 2/6] mm: support __GFP_REPEAT in kvmalloc_node for >=64kB Michal Hocko
2017-01-12 16:12 ` Michael S. Tsirkin
2017-01-14 2:42 ` Tetsuo Handa
2017-01-14 8:45 ` Michal Hocko
2017-01-24 15:40 ` Michael S. Tsirkin
2017-01-12 15:37 ` [PATCH 3/6] rhashtable: simplify a strange allocation pattern Michal Hocko
2017-01-12 15:37 ` [PATCH 4/6] ila: " Michal Hocko
2017-01-12 15:37 ` [PATCH 5/6] treewide: use kv[mz]alloc* rather than opencoded variants Michal Hocko
2017-01-12 15:57 ` David Sterba
2017-01-12 16:05 ` Christian Borntraeger
2017-01-12 16:54 ` Ilya Dryomov
2017-01-12 17:18 ` Michal Hocko
2017-01-12 17:00 ` Dan Williams
2017-01-12 17:26 ` Kees Cook
2017-01-12 17:37 ` Michal Hocko
2017-01-20 13:41 ` Vlastimil Babka
2017-01-24 15:00 ` Michal Hocko
2017-01-25 11:15 ` Vlastimil Babka
2017-01-25 13:09 ` Michal Hocko
2017-01-25 13:40 ` Ilya Dryomov
2017-01-12 17:29 ` Michal Hocko
2017-01-14 3:01 ` Tetsuo Handa
2017-01-14 8:49 ` Michal Hocko
2017-01-12 20:14 ` Boris Ostrovsky
2017-01-13 1:11 ` Dilger, Andreas
2017-01-14 10:56 ` Leon Romanovsky
2017-01-16 7:33 ` Michal Hocko
2017-01-16 8:28 ` Leon Romanovsky
2017-01-16 8:18 ` Tariq Toukan
2017-01-12 15:37 ` [RFC PATCH 6/6] net: use kvmalloc with __GFP_REPEAT rather than open coded variant Michal Hocko
2017-01-24 15:17 ` Michal Hocko [this message]
2017-01-24 16:00 ` [PATCH 0/6 v3] kvmalloc Eric Dumazet
2017-01-25 13:10 ` Michal Hocko
2017-01-24 19:17 ` Alexei Starovoitov
2017-01-25 13:10 ` Michal Hocko
2017-01-25 13:21 ` Michal Hocko
2017-01-25 18:14 Alexei Starovoitov
2017-01-25 20:16 ` Daniel Borkmann
2017-01-26 7:43 ` Michal Hocko
2017-01-26 9:36 ` Daniel Borkmann
2017-01-26 9:48 ` David Laight
2017-01-26 10:08 ` Michal Hocko
2017-01-26 10:32 ` Michal Hocko
2017-01-26 11:04 ` Daniel Borkmann
2017-01-26 11:49 ` Michal Hocko
2017-01-26 12:14 ` Joe Perches
2017-01-26 12:27 ` Michal Hocko
2017-01-26 11:33 ` Daniel Borkmann
2017-01-26 11:58 ` Michal Hocko
2017-01-26 13:10 ` Daniel Borkmann
2017-01-26 13:40 ` Michal Hocko
2017-01-26 14:13 ` Michal Hocko
2017-01-26 20:34 ` Daniel Borkmann
2017-01-27 10:05 ` Michal Hocko
2017-01-27 20:12 ` Daniel Borkmann
2017-01-30 7:56 ` Michal Hocko
2017-01-30 16:15 ` Daniel Borkmann
2017-01-30 16:28 ` Michal Hocko
2017-01-30 16:45 ` Daniel Borkmann
2017-01-30 9:49 Michal Hocko
2017-02-05 10:23 ` Michal Hocko
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