From: Matthew Wilcox <willy@infradead.org>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>,
davem@davemloft.net, daniel@iogearbox.net, andrii@kernel.org,
tj@kernel.org, kafai@fb.com, bpf@vger.kernel.org,
kernel-team@fb.com, linux-mm@kvack.org,
Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [PATCH bpf-next 0/5] bpf: BPF specific memory allocator.
Date: Wed, 6 Jul 2022 19:21:29 +0100 [thread overview]
Message-ID: <YsXSqSMxsvq13dV4@casper.infradead.org> (raw)
In-Reply-To: <20220706180525.ozkxnbifgd4vzxym@MacBook-Pro-3.local.dhcp.thefacebook.com>
On Wed, Jul 06, 2022 at 11:05:25AM -0700, Alexei Starovoitov wrote:
> On Wed, Jul 06, 2022 at 06:55:36PM +0100, Matthew Wilcox wrote:
> > For example, I assume that a BPF program
> > has a fairly tight limit on how much memory it can cause to be allocated.
> > Right?
>
> No. It's constrained by memcg limits only. It can allocate gigabytes.
I'm confused. A BPF program is limited to executing 4096 insns and
using a maximum of 512 bytes of stack space, but it can allocate an
unlimited amount of heap? That seems wrong.
next prev parent reply other threads:[~2022-07-06 18:21 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20220623003230.37497-1-alexei.starovoitov@gmail.com>
2022-06-27 7:03 ` Christoph Hellwig
2022-06-28 0:17 ` Christoph Lameter
2022-06-28 5:01 ` Alexei Starovoitov
2022-06-28 13:57 ` Christoph Lameter
2022-06-28 17:03 ` Alexei Starovoitov
2022-06-29 2:35 ` Christoph Lameter
2022-06-29 2:49 ` Alexei Starovoitov
2022-07-04 16:13 ` Vlastimil Babka
2022-07-06 17:43 ` Alexei Starovoitov
2022-07-19 11:52 ` Vlastimil Babka
2022-07-04 20:34 ` Matthew Wilcox
2022-07-06 17:50 ` Alexei Starovoitov
2022-07-06 17:55 ` Matthew Wilcox
2022-07-06 18:05 ` Alexei Starovoitov
2022-07-06 18:21 ` Matthew Wilcox [this message]
2022-07-06 18:26 ` Alexei Starovoitov
2022-07-06 18:31 ` Matthew Wilcox
2022-07-06 18:36 ` Alexei Starovoitov
2022-07-06 18:40 ` Matthew Wilcox
2022-07-06 18:51 ` Alexei Starovoitov
2022-07-06 18:55 ` Matthew Wilcox
2022-07-08 13:41 ` Michal Hocko
2022-07-08 17:48 ` Alexei Starovoitov
2022-07-08 20:13 ` Yosry Ahmed
2022-07-08 21:55 ` Shakeel Butt
2022-07-10 5:26 ` Alexei Starovoitov
2022-07-10 7:32 ` Shakeel Butt
2022-07-11 12:15 ` Michal Hocko
2022-07-12 4:39 ` Alexei Starovoitov
2022-07-12 7:40 ` Michal Hocko
2022-07-12 8:39 ` Yafang Shao
2022-07-12 9:52 ` Michal Hocko
2022-07-12 15:25 ` Shakeel Butt
2022-07-12 16:32 ` Tejun Heo
2022-07-12 17:26 ` Shakeel Butt
2022-07-12 17:36 ` Tejun Heo
2022-07-12 18:11 ` Shakeel Butt
2022-07-12 18:43 ` Alexei Starovoitov
2022-07-13 13:56 ` Yafang Shao
2022-07-12 19:11 ` Mina Almasry
2022-07-12 16:24 ` Tejun Heo
2022-07-18 14:13 ` Michal Hocko
2022-07-13 2:39 ` Roman Gushchin
2022-07-13 14:24 ` Yafang Shao
2022-07-13 16:24 ` Tejun Heo
2022-07-14 6:15 ` Yafang Shao
2022-07-18 17:55 ` Yosry Ahmed
2022-07-19 11:30 ` cgroup specific sticky resources (was: Re: [PATCH bpf-next 0/5] bpf: BPF specific memory allocator.) Michal Hocko
2022-07-19 18:00 ` Yosry Ahmed
2022-07-19 18:01 ` Yosry Ahmed
2022-07-19 18:46 ` Mina Almasry
2022-07-19 19:16 ` Tejun Heo
2022-07-19 19:30 ` Yosry Ahmed
2022-07-19 19:38 ` Tejun Heo
2022-07-19 19:40 ` Yosry Ahmed
2022-07-19 19:47 ` Mina Almasry
2022-07-19 19:54 ` Tejun Heo
2022-07-19 20:16 ` Mina Almasry
2022-07-19 20:29 ` Tejun Heo
2022-07-20 12:26 ` Michal Hocko
2022-07-12 18:40 ` [PATCH bpf-next 0/5] bpf: BPF specific memory allocator Alexei Starovoitov
2022-07-18 12:27 ` Michal Hocko
2022-07-13 2:27 ` Roman Gushchin
2022-07-11 12:22 ` Michal Hocko
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