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Date:   Fri, 6 Oct 2023 09:32:39 -0400
From:   Sasha Levin <sashal@kernel.org>
To:     Luiz Capitulino <luizcap@amazon.com>
Cc:     "stable@vger.kernel.org" <stable@vger.kernel.org>, krisman@suse.de,
        will@kernel.org, Greg KH <gregkh@linuxfoundation.org>,
        anshuman.khandual@arm.com, catalin.marinas@arm.com
Subject: Re: [5.15,6.1] Please apply a89c6bcdac22bec1bfbe6e64060b4cf5838d4f47
Message-ID: <ZSAMd5jUScAlmzEc@sashalap>
References: <010edf5a-453d-4c98-9c07-12e75d3f983c@amazon.com>
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On Thu, Oct 05, 2023 at 10:59:28AM -0400, Luiz Capitulino wrote:
>Hi,
>
>We found that commits 46bdb4277f98 and 0388f9c74330 (merged in v5.12)
>introduced more than 40% performance regression in UnixBench's process
>creation benchmark when comparing 5.10 with 5.15 and 6.1 on AWS'
>virtualized Graviton instances.
>
>This has been mostly fixed by the following upstream commit:
>
>"""
>commit a89c6bcdac22bec1bfbe6e64060b4cf5838d4f47
>Author: Gabriel Krisman Bertazi <krisman@suse.de>
>Date: Mon Jan 9 12:19:55 2023 -0300
>
> arm64: Avoid repeated AA64MMFR1_EL1 register read on pagefault path
>"""

Queued up, thanks!

-- 
Thanks,
Sasha