From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>, Tejun Heo <tj@kernel.org>,
Delyan Kratunov <delyank@fb.com>, linux-mm <linux-mm@kvack.org>,
bpf <bpf@vger.kernel.org>, Kernel Team <kernel-team@fb.com>
Subject: Re: [PATCH v3 bpf-next 00/15] bpf: BPF specific memory allocator.
Date: Wed, 24 Aug 2022 17:16:44 -0700 [thread overview]
Message-ID: <CAADnVQKt-i3SitwjMkGGG9mEsKh=Hmjg1C-omkhLw_pg6gaQVw@mail.gmail.com> (raw)
In-Reply-To: <CAP01T75WHh_zCgM6uf=W5uQzJSWODnsZNy0g-Wj2Z+KOoDW_FQ@mail.gmail.com>
On Wed, Aug 24, 2022 at 1:03 PM Kumar Kartikeya Dwivedi
<memxor@gmail.com> wrote:
>
> On Fri, 19 Aug 2022 at 23:42, Alexei Starovoitov
> <alexei.starovoitov@gmail.com> wrote:
> >
> > From: Alexei Starovoitov <ast@kernel.org>
> >
> > Introduce any context BPF specific memory allocator.
> >
> > Tracing BPF programs can attach to kprobe and fentry. Hence they
> > run in unknown context where calling plain kmalloc() might not be safe.
> > Front-end kmalloc() with per-cpu cache of free elements.
> > Refill this cache asynchronously from irq_work.
> >
> > Major achievements enabled by bpf_mem_alloc:
> > - Dynamically allocated hash maps used to be 10 times slower than fully preallocated.
> > With bpf_mem_alloc and subsequent optimizations the speed of dynamic maps is equal to full prealloc.
> > - Tracing bpf programs can use dynamically allocated hash maps.
> > Potentially saving lots of memory. Typical hash map is sparsely populated.
> > - Sleepable bpf programs can used dynamically allocated hash maps.
> >
>
> From my side, for the whole series:
> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Thanks a bunch for all the suggestions.
Especially for ideas that led to rewrite of patch 1.
It looks much simpler now.
I've missed #include <asm/local.h> in the patch 1.
In the respin I'm going to keep your Ack if you don't mind.
Thanks!
prev parent reply other threads:[~2022-08-25 0:16 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-19 21:42 Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 01/15] bpf: Introduce any context " Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 02/15] bpf: Convert hash map to bpf_mem_alloc Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 03/15] selftests/bpf: Improve test coverage of test_maps Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 04/15] samples/bpf: Reduce syscall overhead in map_perf_test Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 05/15] bpf: Relax the requirement to use preallocated hash maps in tracing progs Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 06/15] bpf: Optimize element count in non-preallocated hash map Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 07/15] bpf: Optimize call_rcu " Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 08/15] bpf: Adjust low/high watermarks in bpf_mem_cache Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 09/15] bpf: Batch call_rcu callbacks instead of SLAB_TYPESAFE_BY_RCU Alexei Starovoitov
2022-08-24 19:58 ` Kumar Kartikeya Dwivedi
2022-08-25 0:13 ` Alexei Starovoitov
2022-08-25 0:35 ` Joel Fernandes
2022-08-25 0:49 ` Joel Fernandes
2022-08-19 21:42 ` [PATCH v3 bpf-next 10/15] bpf: Add percpu allocation support to bpf_mem_alloc Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 11/15] bpf: Convert percpu hash map to per-cpu bpf_mem_alloc Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 12/15] bpf: Remove tracing program restriction on map types Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 13/15] bpf: Prepare bpf_mem_alloc to be used by sleepable bpf programs Alexei Starovoitov
2022-08-19 22:21 ` Kumar Kartikeya Dwivedi
2022-08-19 22:43 ` Alexei Starovoitov
2022-08-19 22:56 ` Kumar Kartikeya Dwivedi
2022-08-19 23:01 ` Alexei Starovoitov
2022-08-24 19:49 ` Kumar Kartikeya Dwivedi
2022-08-25 0:08 ` Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 14/15] bpf: Remove prealloc-only restriction for " Alexei Starovoitov
2022-08-19 21:42 ` [PATCH v3 bpf-next 15/15] bpf: Introduce sysctl kernel.bpf_force_dyn_alloc Alexei Starovoitov
2022-08-24 20:03 ` [PATCH v3 bpf-next 00/15] bpf: BPF specific memory allocator Kumar Kartikeya Dwivedi
2022-08-25 0:16 ` Alexei Starovoitov [this message]
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