From: Steve Simon <steve@quintile.net>
To: tuhs@tuhs.org
Subject: [TUHS] kernel debugging in analogue
Date: Sat, 2 Jul 2022 00:38:11 +0100 [thread overview]
Message-ID: <D50BAA95-98D3-435A-B9D4-F11E5B0C9F88@quintile.net> (raw)
i remember a fellow student debugging an lsi11 kernel using a form of analogue vectorscope.
i think it had a pair of DACs attached to the upper bits of the address bus. it generated a 2d pattern which you could recognise as particular code - interrupts are here, userspace is there, etc.
the brightness of the spot indicated the time spent, so you got a bit of profiling too - and deadlocks became obvious.
anyone remember these, what where they called? i think it was an HP or Tek product.
-Steve
next reply other threads:[~2022-07-01 23:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-01 23:38 Steve Simon [this message]
2022-07-02 1:52 ` [TUHS] " Al Kossow
2022-07-02 1:57 ` Al Kossow
2022-07-02 2:45 ` Grant Taylor via TUHS
2022-07-02 2:50 ` Al Kossow
2022-07-02 6:20 ` Grant Taylor via TUHS
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=D50BAA95-98D3-435A-B9D4-F11E5B0C9F88@quintile.net \
--to=steve@quintile.net \
--cc=tuhs@tuhs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).