linux-kernel - Re: [PATCH v3 tip/perf/core 1/4] mm: introduce mmap_lock_speculation

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Message-ID: <haivdc546utidpbb626qsmuwsa3f3aorurqn5khwsqqxflpu3w@xbdqwoty4blv>
Date: Sun, 13 Oct 2024 00:56:06 -0700
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Andrii Nakryiko <andrii@...nel.org>
Cc: linux-trace-kernel@...r.kernel.org, linux-mm@...ck.org, 
	peterz@...radead.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, 
	akpm@...ux-foundation.org, mjguzik@...il.com, brauner@...nel.org, jannh@...gle.com, 
	mhocko@...nel.org, vbabka@...e.cz, hannes@...xchg.org, Liam.Howlett@...cle.com, 
	lorenzo.stoakes@...cle.com
Subject: Re: [PATCH v3 tip/perf/core 1/4] mm: introduce
 mmap_lock_speculation_{start|end}

On Thu, Oct 10, 2024 at 01:56:41PM GMT, Andrii Nakryiko wrote:
> From: Suren Baghdasaryan <surenb@...gle.com>
> 
> Add helper functions to speculatively perform operations without
> read-locking mmap_lock, expecting that mmap_lock will not be
> write-locked and mm is not modified from under us.
> 
> Suggested-by: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
> Link: https://lore.kernel.org/bpf/20240912210222.186542-1-surenb@google.com

Looks good to me. mmap_lock_speculation_* functions could use kerneldoc
but that can be added later.

Reviewed-by: Shakeel Butt <shakeel.butt@...ux.dev>