linux-kernel - Re: [PATCH v2 00/11] perf/uprobe: Optimize uprobes

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Message-ID: <20240715144536.GI14400@noisy.programming.kicks-ass.net>
Date: Mon, 15 Jul 2024 16:45:36 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: oleg@...hat.com, mingo@...nel.org, andrii@...nel.org,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	rostedt@...dmis.org, mhiramat@...nel.org, jolsa@...nel.org,
	clm@...a.com, paulmck@...nel.org
Subject: Re: [PATCH v2 00/11] perf/uprobe: Optimize uprobes

On Thu, Jul 11, 2024 at 09:57:44PM -0700, Andrii Nakryiko wrote:

> But then I also ran it on Linux built from perf/uprobes branch (these
> patches), and after a few seconds I see that there is no more
> attachment/detachment happening. Eventually I got splats, which you
> can see in [1]. I used `sudo ./uprobe-stress -a10 -t5 -m5 -f3` command
> to run it inside my QEMU image.

So them git voodoo incantations did work and I got it built. I'm running
that exact same line above (minus the sudo, because test box only has a
root account I think) on real hardware.

I'm now ~100 periods in and wondering what 'eventually' means...

Also, this is a 2 socket, 10 core per socket, 2 threads per core
ivybridge thing, are those parameters sufficient?