linux-kernel - Re: [PATCH v4 tip/perf/core 0/4] uprobes,mm: speculative lockless VMA-to-uprobe lookup

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Message-ID: <Zz4IQaF9CCfjS28S@gmail.com>
Date: Wed, 20 Nov 2024 17:03:13 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Andrii Nakryiko <andrii.nakryiko@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-trace-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org, oleg@...hat.com, rostedt@...dmis.org,
	mhiramat@...nel.org, bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org, jolsa@...nel.org, paulmck@...nel.org,
	willy@...radead.org, surenb@...gle.com, mjguzik@...il.com,
	brauner@...nel.org, jannh@...gle.com, mhocko@...nel.org,
	Andrii Nakryiko <andrii@...nel.org>, vbabka@...e.cz,
	shakeel.butt@...ux.dev, hannes@...xchg.org, Liam.Howlett@...cle.com,
	lorenzo.stoakes@...cle.com, david@...hat.com, arnd@...db.de,
	richard.weiyang@...il.com, zhangpeng.00@...edance.com,
	linmiaohe@...wei.com, viro@...iv.linux.org.uk, hca@...ux.ibm.com,
	Mark Rutland <mark.rutland@....com>, Will Deacon <will@...nel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Kernel Team <kernel-team@...a.com>
Subject: Re: [PATCH v4 tip/perf/core 0/4] uprobes,mm: speculative lockless
 VMA-to-uprobe lookup


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Wed, Nov 20, 2024 at 07:40:15AM -0800, Andrii Nakryiko wrote:
> > Linus,
> > 
> > I'm not sure what's going on here, this patch set seems to be in some
> > sort of "ignore list" on Peter's side with no indication on its
> > destiny.
> 
> *sigh* it is not, but my inbox is like drinking from a firehose :/

And I've been considering that particular series WIP for two reasons:

 1) Oleg was still unconvinced about patch 5/5 in the v2 discussion. 
    Upon re-reading it I think he might have come around and has agreed 
    to the current approach - but sending a v3 & not seeing Oleg object 
    would ascertain that.

 2) There was a build failure reported against -v2 at:

       https://lore.kernel.org/all/202410050745.2Nuvusy4-lkp@intel.com/t.mbox.gz

    We cannot and will not merge patches with build failures.

Andrii did get some other uprobes scalability work merged in v6.13:

    - Switch to RCU Tasks Trace flavor for better performance (Andrii Nakryiko)

    - Massively increase uretprobe SMP scalability by SRCU-protecting
      the uretprobe lifetime (Andrii Nakryiko)

So we've certainly not been ignoring his patches, to the contrary ...

Thanks,

	Ingo