linux-kernel - Re: [PATCH v4 tip/perf/core 1/4] mm: Convert mm_lock

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Message-ID: <f6110121-ddeb-4b95-8a7e-a971d720d392@suse.cz>
Date: Tue, 29 Oct 2024 12:52:47 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Andrii Nakryiko <andrii@...nel.org>, linux-trace-kernel@...r.kernel.org,
 linux-mm@...ck.org, akpm@...ux-foundation.org, peterz@...radead.org
Cc: 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,
 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
Subject: Re: [PATCH v4 tip/perf/core 1/4] mm: Convert mm_lock_seq to a proper
 seqcount

On 10/28/24 02:08, Andrii Nakryiko wrote:
> From: Suren Baghdasaryan <surenb@...gle.com>
> 
> Convert mm_lock_seq to be seqcount_t and change all mmap_write_lock
> variants to increment it, in-line with the usual seqcount usage pattern.
> This lets us check whether the mmap_lock is write-locked by checking
> mm_lock_seq.sequence counter (odd=locked, even=unlocked). This will be
> used when implementing mmap_lock speculation functions.
> As a result vm_lock_seq is also change to be unsigned to match the type
> of mm_lock_seq.sequence.
> 
> Suggested-by: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> Signed-off-by: Andrii Nakryiko <andrii@...nel.org>

Acked-by: Vlastimil Babka <vbabka@...e.cz>