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Date: Mon, 10 Feb 2025 19:30:01 +0200
Message-Id: <D7OXZTO4LKTX.V4J1P9Q4OP0T@kernel.org>
From: "Jarkko Sakkinen" <jarkko@kernel.org>
To: "Jonathan McDowell" <noodles@earth.li>, =?utf-8?q?Michal_Such=C3=A1nek?=
 <msuchanek@suse.de>
Cc: <linux-integrity@vger.kernel.org>
Subject: Re: TPM operation times out (very rarely)
X-Mailer: aerc 0.20.1
References: <D7GFCNGDK7S6.1X0KPPHF1TXBO@kernel.org>
 <Z50IKdYe42_n2B0b@kitsune.suse.cz> <D7GIBDO5KJMD.118CQO10LJ79Y@kernel.org>
 <Z6Nm7Y8TFF8YG56Z@kitsune.suse.cz> <Z6N10NQY75hpX0Ed@earth.li>
 <Z6UdFCdqCNZ8VGOL@kernel.org> <Z6XRuFnEXeQI_rEZ@earth.li>
 <Z6XVAEfLIVDuwSLn@kitsune.suse.cz> <Z6XWoWAy66P97pAU@earth.li>
 <Z6XZN3U5nmb6qu9u@kitsune.suse.cz> <Z6olt1NHonKkamtM@earth.li>
In-Reply-To: <Z6olt1NHonKkamtM@earth.li>

On Mon Feb 10, 2025 at 6:13 PM EET, Jonathan McDowell wrote:
> FWIW bpftrace is great for this. I'm using the attached script as a
> basis for investigations. Obviously the timings it reports are the whole
> command rather than just the wait for status, but over a long period it
> can then show you the latency histogram. (Run it in one terminal, do TPM
> stuff elsewhere, hit Ctrl-C when you're done and it dumps the
> histogram.)
>
> J.

Yes, I used that to trace and spot issues with HMAC integrity protection
in the near past.

BR, Jarkko