linux-kernel - Re: [PATCH v4] kprobes,lib: kretprobe scalability improvement

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Date:   Fri, 4 Nov 2022 00:46:55 +0800
From:   wuqiang <wuqiang.matt@...edance.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     mhiramat@...nel.org, davem@...emloft.net,
        anil.s.keshavamurthy@...el.com, naveen.n.rao@...ux.ibm.com,
        rostedt@...dmis.org, peterz@...radead.org, sander@...nheule.net,
        ebiggers@...gle.com, dan.j.williams@...el.com, jpoimboe@...nel.org,
        linux-kernel@...r.kernel.org, mattwu@....com,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v4] kprobes,lib: kretprobe scalability improvement

On 2022/11/3 05:33, Andrew Morton wrote:
> On Wed,  2 Nov 2022 10:30:12 +0800 wuqiang <wuqiang.matt@...edance.com> wrote:
> 
>> Tests of
>> kretprobe throughput show the biggest ratio as 333.9x of the original
>> freelist.
> 
> Seriously.
> 
> I'll add this for some runtime testing.

Thanks.

> 
> Are you able to identify other parts of the kernel which could use
> (and benefit from) the new objpool?

The scalability issue is caused by freelist. Currently kretprobe and rethook 
are the only use cases.

I'm working on the evaluation of bpf percpu-freelist, which scales well but 
uses raw_spinlock and needs local irq disabled.