linux-kernel - Re: [PATCH] erofs: fix PSI memstall accounting

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Message-ID: <CAKPOu+_4z4NDG1CmqsBatJVF1rQXHvqHV6fUiHEcnBswa_u8BQ@mail.gmail.com>
Date: Tue, 3 Dec 2024 14:30:27 +0100
From: Max Kellermann <max.kellermann@...os.com>
To: Gao Xiang <hsiangkao@...ux.alibaba.com>
Cc: linux-erofs@...ts.ozlabs.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] erofs: fix PSI memstall accounting

On Tue, Dec 3, 2024 at 9:15 AM Gao Xiang <hsiangkao@...ux.alibaba.com> wrote:
> But I guess you could record more frame addresses to get the caller
> of readahead_expand()? e.g. __builtin_return_address(1)?

This turned out to be a big disaster. __builtin_return_address(1)
instantly crashes the kernel, causing the whole (production) cluster
to go down.