linux-kernel - Re: [PATCH] vfs: use RCU in ilookup

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Message-ID: <f6ba51c5-e2e0-4287-b995-8a7dff59d5b9@amd.com>
Date: Mon, 15 Jul 2024 13:32:42 +0530
From: Bharata B Rao <bharata@....com>
To: Mateusz Guzik <mjguzik@...il.com>, brauner@...nel.org
Cc: viro@...iv.linux.org.uk, jack@...e.cz, linux-kernel@...r.kernel.org,
 linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] vfs: use RCU in ilookup

On 15-Jul-24 12:43 PM, Mateusz Guzik wrote:
> A soft lockup in ilookup was reported when stress-testing a 512-way
> system [1] (see [2] for full context) and it was verified that not
> taking the lock shifts issues back to mm.
> 
> [1] https://lore.kernel.org/linux-mm/56865e57-c250-44da-9713-cf1404595bcc@amd.com/

Mateusz,

Just want to mention explicitly that in addition to the lockless lookup 
changes that you suggested in [1], the test run also included your other 
commit 
https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git/commit/?h=vfs.inode.rcu&id=7180f8d91fcbf252de572d9ffacc945effed0060 
as you had suggested.

Regards,
Bharata.