From: Tao Chen <chen.dylane@linux.dev>
To: Yonghong Song <yonghong.song@linux.dev>,
peterz@infradead.org, mingo@redhat.com, acme@kernel.org,
namhyung@kernel.org, mark.rutland@arm.com,
alexander.shishkin@linux.intel.com, jolsa@kernel.org,
irogers@google.com, adrian.hunter@intel.com,
kan.liang@linux.intel.com, Andrii Nakryiko <andrii@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>
Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org
Subject: Re: [PATCH bpf-next v6 2/2] bpf: Hold the perf callchain entry until used completely
Date: Wed, 3 Dec 2025 17:33:29 +0800 [thread overview]
Message-ID: <42627219-fa33-441d-b8cb-eb48ab3230d6@linux.dev> (raw)
In-Reply-To: <7b82e322-eab7-4fc2-9de1-d10ad8251378@linux.dev>
在 2025/11/26 17:29, Tao Chen 写道:
> 在 2025/11/14 00:01, Yonghong Song 写道:
>>
>>
>> On 11/12/25 8:31 AM, Tao Chen wrote:
>>> As Alexei noted, get_perf_callchain() return values may be reused
>>> if a task is preempted after the BPF program enters migrate disable
>>> mode. The perf_callchain_entres has a small stack of entries, and
>>> we can reuse it as follows:
>>>
>>> 1. get the perf callchain entry
>>> 2. BPF use...
>>> 3. put the perf callchain entry
>>>
>>> And Peter suggested that get_recursion_context used with preemption
>>> disabled, so we should disable preemption at BPF side.
>>>
>>> Signed-off-by: Tao Chen <chen.dylane@linux.dev>
>>
>> Acked-by: Yonghong Song <yonghong.song@linux.dev>
>>
>
> Hi eBPF maintainers,
>
> This patch appears to have missed the eBPF maintainers on the list,
> please review it again, thanks.
>
ping...
--
Best Regards
Tao Chen
next prev parent reply other threads:[~2025-12-03 9:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-12 16:31 [PATCH bpf-next v6 0/2] Pass external callchain entry to get_perf_callchain Tao Chen
2025-11-12 16:31 ` [PATCH bpf-next v6 1/2] perf: Refactor get_perf_callchain Tao Chen
2025-11-12 16:31 ` [PATCH bpf-next v6 2/2] bpf: Hold the perf callchain entry until used completely Tao Chen
2025-11-13 16:01 ` Yonghong Song
2025-11-26 9:29 ` Tao Chen
2025-12-03 9:33 ` Tao Chen [this message]
2025-12-16 23:35 ` Alexei Starovoitov
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