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Date: Fri, 8 Mar 2024 16:37:52 +0800
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Subject: Re: [PATCH -next v6 0/2] Make memory reclamation measurable
To: Michal Hocko <mhocko@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>, akpm@linux-foundation.org,
 mhiramat@kernel.org, mathieu.desnoyers@efficios.com,
 linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
 linux-mm@kvack.org, opensource.kernel@vivo.com
References: <20240105013607.2868-1-cuibixuan@vivo.com>
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 <a32030f0-b6f6-4bd6-8284-bb762ccf9205@vivo.com> <ZemIOtbIoMYqcf-V@tiehlicka>
From: Bixuan Cui <cuibixuan@vivo.com>
In-Reply-To: <ZemIOtbIoMYqcf-V@tiehlicka>
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在 2024/3/7 17:26, Michal Hocko 写道:
>> The main reasons for adding static tracepoints are:
>> 1. To subdivide the time spent in the shrinker->count_objects() and
>> shrinker->scan_objects() functions within the do_shrink_slab function. Using
>> BPF kprobe, we can only track the time spent in the do_shrink_slab function.
>> 2. When tracing frequently called functions, static tracepoints (BPF
>> tp/tracepoint) have lower performance impact compared to dynamic tracepoints
>> (BPF kprobe).
> You can track the time process has been preempted by other means, no? We
> have context switching tracepoints in place. Have you considered that
> option?
Let me think about it...

Thanks
Bixuan Cui