linux-kernel - Re: 9p fs-cache tests/benchmark (was: 9p fscache Duplicate cookie detected)

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Date:   Mon, 11 Apr 2022 09:10:31 +0100
From:   David Howells <dhowells@...hat.com>
To:     Christian Schoenebeck <linux_oss@...debyte.com>
Cc:     dhowells@...hat.com, asmadeus@...ewreck.org,
        David Kahurani <k.kahurani@...il.com>, davem@...emloft.net,
        ericvh@...il.com, kuba@...nel.org, linux-kernel@...r.kernel.org,
        lucho@...kov.net, netdev@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net, Greg Kurz <groug@...d.org>
Subject: Re: 9p fs-cache tests/benchmark (was: 9p fscache Duplicate cookie detected)

Christian Schoenebeck <linux_oss@...debyte.com> wrote:

> From looking at the sources, the call stack for emitting "FS-Cache: Duplicate
> cookie detected" error messages with 9p "cache=mmap" option seems to be:

You might find these tracepoints useful:

echo 1 >/sys/kernel/debug/tracing/events/fscache/fscache_cookie/enable
echo 1 >/sys/kernel/debug/tracing/events/fscache/fscache_acquire/enable
echo 1 >/sys/kernel/debug/tracing/events/fscache/fscache_relinquish/enable

David