Re: [PATCH v9 11/17] mm: replace vm_lock and detached flag with a reference count

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To: Suren Baghdasaryan <surenb@xxxxxxxxxx>, Mateusz Guzik <mjguzik@xxxxxxxxx>, Hillf Danton <hdanton@xxxxxxxx>
Subject: Re: [PATCH v9 11/17] mm: replace vm_lock and detached flag with a reference count
From: Vlastimil Babka <vbabka@xxxxxxx>
Date: Sat, 11 Jan 2025 21:38:54 +0100
Cc: akpm@xxxxxxxxxxxxxxxxxxxx, peterz@xxxxxxxxxxxxx, willy@xxxxxxxxxxxxx, liam.howlett@xxxxxxxxxx, lorenzo.stoakes@xxxxxxxxxx, david.laight.linux@xxxxxxxxx, mhocko@xxxxxxxx, hannes@xxxxxxxxxxx, oliver.sang@xxxxxxxxx, mgorman@xxxxxxxxxxxxxxxxxxx, david@xxxxxxxxxx, peterx@xxxxxxxxxx, oleg@xxxxxxxxxx, dave@xxxxxxxxxxxx, paulmck@xxxxxxxxxx, brauner@xxxxxxxxxx, dhowells@xxxxxxxxxx, hdanton@xxxxxxxx, hughd@xxxxxxxxxx, lokeshgidra@xxxxxxxxxx, minchan@xxxxxxxxxx, jannh@xxxxxxxxxx, shakeel.butt@xxxxxxxxx, souravpanda@xxxxxxxxxx, pasha.tatashin@xxxxxxxxxx, klarasmodin@xxxxxxxxx, richard.weiyang@xxxxxxxxx, corbet@xxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, kernel-team@xxxxxxxxxxx
In-reply-to: <CAJuCfpGu4UVXiBaivTVOGNBVVz3rhZ+VY27gT3_R0cTij5fTGw@mail.gmail.com>
References: <20250111042604.3230628-1-surenb@google.com> <20250111042604.3230628-12-surenb@google.com> <gdipfy63r4wxiqlnglsjzatpej6jjswimuzadm2l57o2e45u56@qfd763n4ysft> <CAJuCfpGu4UVXiBaivTVOGNBVVz3rhZ+VY27gT3_R0cTij5fTGw@mail.gmail.com>
User-agent: Mozilla Thunderbird

On 1/11/25 21:14, Suren Baghdasaryan wrote:
> I plan on replacing refcount_t usage here with an atomic since, as
> Hillf noted, refcount is not designed to be used for locking. And will
> make sure the down_read_trylock() replacement will provide an acquire
> fence.

Could Hillf stop reducing the Cc list on his replies? The whole subthread
went to only few people :(

References:
- [PATCH v9 00/17] reimplement per-vma lock as a refcount
  - From: Suren Baghdasaryan
- [PATCH v9 11/17] mm: replace vm_lock and detached flag with a reference count
  - From: Suren Baghdasaryan
- Re: [PATCH v9 11/17] mm: replace vm_lock and detached flag with a reference count
  - From: Mateusz Guzik
- Re: [PATCH v9 11/17] mm: replace vm_lock and detached flag with a reference count
  - From: Suren Baghdasaryan

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