linux-kernel - Re: [PATCH v2 3/3] mm: introduce mmap_lock_speculate_{try

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Message-ID: <20241122110557.GO24774@noisy.programming.kicks-ass.net>
Date: Fri, 22 Nov 2024 12:05:57 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: akpm@...ux-foundation.org, andrii@...nel.org, jannh@...gle.com,
	Liam.Howlett@...cle.com, lorenzo.stoakes@...cle.com, vbabka@...e.cz,
	mhocko@...nel.org, shakeel.butt@...ux.dev, hannes@...xchg.org,
	david@...hat.com, willy@...radead.org, brauner@...nel.org,
	oleg@...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, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] mm: introduce
 mmap_lock_speculate_{try_begin|retry}

On Thu, Nov 21, 2024 at 08:28:26AM -0800, Suren Baghdasaryan wrote:
> 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>

Thanks for these, you're okay with me taking these through tip/perf/core
for the next cycle along with Andrii's uprobe patch?