Re: [PATCH 08/41] mm: introduce CONFIG_PER_VMA_LOCK

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To: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: Re: [PATCH 08/41] mm: introduce CONFIG_PER_VMA_LOCK
From: Michal Hocko <mhocko@xxxxxxxx>
Date: Wed, 11 Jan 2023 17:44:38 +0100
Cc: David Laight <David.Laight@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "michel@xxxxxxxxxxxxxx" <michel@xxxxxxxxxxxxxx>, "joelaf@xxxxxxxxxx" <joelaf@xxxxxxxxxx>, "songliubraving@xxxxxx" <songliubraving@xxxxxx>, "leewalsh@xxxxxxxxxx" <leewalsh@xxxxxxxxxx>, "david@xxxxxxxxxx" <david@xxxxxxxxxx>, "peterz@xxxxxxxxxxxxx" <peterz@xxxxxxxxxxxxx>, "bigeasy@xxxxxxxxxxxxx" <bigeasy@xxxxxxxxxxxxx>, "peterx@xxxxxxxxxx" <peterx@xxxxxxxxxx>, "dhowells@xxxxxxxxxx" <dhowells@xxxxxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, "edumazet@xxxxxxxxxx" <edumazet@xxxxxxxxxx>, "jglisse@xxxxxxxxxx" <jglisse@xxxxxxxxxx>, "punit.agrawal@xxxxxxxxxxxxx" <punit.agrawal@xxxxxxxxxxxxx>, "arjunroy@xxxxxxxxxx" <arjunroy@xxxxxxxxxx>, "minchan@xxxxxxxxxx" <minchan@xxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, "hughd@xxxxxxxxxx" <hughd@xxxxxxxxxx>, "willy@xxxxxxxxxxxxx" <willy@xxxxxxxxxxxxx>, "gurua@xxxxxxxxxx" <gurua@xxxxxxxxxx>, "laurent.dufour@xxxxxxxxxx" <laurent.dufour@xxxxxxxxxx>, "linux-arm-kernel@xxxxxxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, "rientjes@xxxxxxxxxx" <rientjes@xxxxxxxxxx>, "axelrasmussen@xxxxxxxxxx" <axelrasmussen@xxxxxxxxxx>, "kernel-team@xxxxxxxxxxx" <kernel-team@xxxxxxxxxxx>, "soheil@xxxxxxxxxx" <soheil@xxxxxxxxxx>, "paulmck@xxxxxxxxxx" <paulmck@xxxxxxxxxx>, "jannh@xxxxxxxxxx" <jannh@xxxxxxxxxx>, "liam.howlett@xxxxxxxxxx" <liam.howlett@xxxxxxxxxx>, "shakeelb@xxxxxxxxxx" <shakeelb@xxxxxxxxxx>, "luto@xxxxxxxxxx" <luto@xxxxxxxxxx>, "gthelen@xxxxxxxxxx" <gthelen@xxxxxxxxxx>, "ldufour@xxxxxxxxxxxxx" <ldufour@xxxxxxxxxxxxx>, "vbabka@xxxxxxx" <vbabka@xxxxxxx>, "posk@xxxxxxxxxx" <posk@xxxxxxxxxx>, "lstoakes@xxxxxxxxx" <lstoakes@xxxxxxxxx>, "peterjung1337@xxxxxxxxx" <peterjung1337@xxxxxxxxx>, "linuxppc-dev@xxxxxxxxxxxxxxxx" <linuxppc-dev@xxxxxxxxxxxxxxxx>, "kent.overstreet@xxxxxxxxx" <kent.overstreet@xxxxxxxxx>, "hughlynch@xxxxxxxxxx" <hughlynch@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "hannes@xxxxxxxxxxx" <hannes@xxxxxxxxxxx>, "akpm@xxxxxxxxxxxxxxxxxxxx" <akpm@xxxxxxxxxxxxxxxxxxxx>, "tatashin@xxxxxxxxxx" <tatashin@xxxxxxxxxx>
In-reply-to: <CAJuCfpH_VZq99=vGQGJ+evVg5wMPKGsjyawgHnOeoKhtEiAi6w@mail.gmail.com>
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On Wed 11-01-23 08:28:49, Suren Baghdasaryan wrote:
[...]
> Anyhow. Sounds like the overhead of the current design is small enough
> to remove CONFIG_PER_VMA_LOCK and let it depend only on architecture
> support?

Yes. Further optimizations can be done on top. Let's not over optimize
at this stage.
-- 
Michal Hocko
SUSE Labs

Follow-Ups:
- Re: [PATCH 08/41] mm: introduce CONFIG_PER_VMA_LOCK
  - From: Suren Baghdasaryan

References:
- [PATCH 00/41] Per-VMA locks
  - From: Suren Baghdasaryan
- [PATCH 08/41] mm: introduce CONFIG_PER_VMA_LOCK
  - From: Suren Baghdasaryan
- Re: [PATCH 08/41] mm: introduce CONFIG_PER_VMA_LOCK
  - From: Davidlohr Bueso
- Re: [PATCH 08/41] mm: introduce CONFIG_PER_VMA_LOCK
  - From: Suren Baghdasaryan
- Re: [PATCH 08/41] mm: introduce CONFIG_PER_VMA_LOCK
  - From: Michal Hocko
- Re: [PATCH 08/41] mm: introduce CONFIG_PER_VMA_LOCK
  - From: Ingo Molnar
- RE: [PATCH 08/41] mm: introduce CONFIG_PER_VMA_LOCK
  - From: David Laight
- Re: [PATCH 08/41] mm: introduce CONFIG_PER_VMA_LOCK
  - From: Suren Baghdasaryan

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