From: Martin KaFai Lau <martin.lau@linux.dev>
To: Namhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
linux-perf-users@vger.kernel.org, Song Liu <song@kernel.org>,
bpf@vger.kernel.org, Blake Jones <blakejones@google.com>,
Chris Li <chriscli@google.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Jiri Olsa <jolsa@kernel.org>
Subject: Re: [PATCH] perf lock contention: Do not use BPF task local storage
Date: Mon, 9 Jan 2023 13:22:46 -0800 [thread overview]
Message-ID: <7ec772fb-2108-5945-a308-4bb46fcf0090@linux.dev> (raw)
In-Reply-To: <CAM9d7cjk_7-ALzW1kT961TRLpO9Wt8gNX7+rH4ay4N92g1TYkg@mail.gmail.com>
On 1/9/23 12:56 PM, Namhyung Kim wrote:
> Hello,
>
> On Mon, Nov 21, 2022 at 9:33 AM Martin KaFai Lau <martin.lau@linux.dev> wrote:
>>
>> On 11/18/22 11:01 AM, Namhyung Kim wrote:
>>> We could fix the task local storage to use the safe BPF allocator,
>>> but it takes time so let's change this until it happens actually.
>>
>> I also got another report on the kfree_rcu path. I am also looking into this
>> direction on using the BPF allocator.
>
> Any progress on this? Are there any concerns about the change?
Yep, I am working on it. It is not a direct replacement from kzalloc to
bpf_mem_cache_alloc. eg. Some changes in the bpf mem allocator is needed to
ensure the free list cannot be reused before the rcu grace period. There is a
similar RFC patchset going into this direction that I am trying with.
next prev parent reply other threads:[~2023-01-09 21:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-18 19:01 [PATCH] perf lock contention: Do not use BPF task local storage Namhyung Kim
2022-11-21 17:32 ` Martin KaFai Lau
2022-11-23 13:49 ` Arnaldo Carvalho de Melo
2023-01-09 20:56 ` Namhyung Kim
2023-01-09 21:22 ` Martin KaFai Lau [this message]
2023-01-09 22:25 ` Namhyung Kim
2023-01-10 3:29 ` Hou Tao
2023-01-10 6:29 ` Martin KaFai Lau
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