From: jim.cromie@gmail.com
To: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Stanimir Varbanov <stanimir.varbanov@linaro.org>,
Joe Perches <joe@perches.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Linux Documentation List <linux-doc@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-btrfs@vger.kernel.org, linux-acpi@vger.kernel.org,
netdev@vger.kernel.org, Jason Baron <jbaron@akamai.com>
Subject: Re: [PATCH v3 6/7] venus: Make debug infrastructure more flexible
Date: Thu, 11 Jun 2020 18:08:48 -0600 [thread overview]
Message-ID: <CAJfuBxyUfzM-Jmf_39YJHgfy0jLXdRjhdsNLuUacZbJA2unjcg@mail.gmail.com> (raw)
In-Reply-To: <CAJfuBxzE=A0vzsjNai_jU_16R_P0haYA-FHnjZcaHOR_3fy__A@mail.gmail.com>
calling out some thinkos
On Thu, Jun 11, 2020 at 3:19 PM <jim.cromie@gmail.com> wrote:
>
> heres what I have in mind. whats described here is working.
> I'll send it out soon
>
> commit 20298ec88cc2ed64269c8be7b287a24e60a5347e
> Author: Jim Cromie <jim.cromie@gmail.com>
> Date: Wed Jun 10 12:55:08 2020 -0600
>
> dyndbg: WIP towards module->debugflags based callsite controls
>
> There are *lots* of ad-hoc debug printing solutions in kernel,
> this is a 1st attempt at providing a common mechanism for many of them.
>
> Basically, there are 2 styles of debug printing:
> - levels, with increasing verbosity, 1-10 forex
> - bits/flags, independently controlling separate groups of dprints
>
> This patch does bits/flags (with no distinction made yet between 2)
>
> API:
>
> - change pr_debug(...) --> pr_debug_typed(type_id=0, ...)
pr_debug, pr_debug_n now in printk.h
_?_?dynamic_.+_cl adaptations in dynamic_debug.h
> - all existing uses have type_id=0
> - developer creates exclusive types of log messages with type_id>0
> 1, 2, 3 are disjoint groups, for example: hi, mid, low
>
> - !!type_id is just an additional callsite selection criterion
>
> Qfoo() { echo module foo $* >/proc/dynamic_debug/control }
> Qfoo +p # all groups, including default 0
> Qfoo mflags 1 +p # only group 1
> Qfoo mflags 12 +p # TBD[1]: groups 1 or 2
> Qfoo mflags 0 +p # ignored atm TBD[2]
> Qfoo mflags af +p # TBD[3]: groups a or f (10 or 15)
>
> so patch does:
>
> - add u32 debugflags to struct module. Each bit is a separate print-class.
this is feeling wrong now.
setting these bits would have to trigger an update via ddebug_exec_query
kinda like setting a bit would trigger
echo module $foo mflags $bitpos +p > control
its possible, but not 1st, or 2nd perhaps.
In general Im quite leery of rigging up some callback to do it.
its prudent to effect all debug changes via >control
> - in ddebug_change()
> filter on !! module->debugflags,
> IFF query->module is given, and matches dt->mod_name
> and query->mflags is given, and bitmatches module->debugflags
wrong, ddebug_change cannot respond to changes of debugflags,
most it could do is consult it on queries
> - in parse_query()
> accept new query term: mflags $arg
> populate query->mflags
> arg-type needs some attention, but basic plumbing is there
>
> WIP: not included:
>
> - pr_debug_typed( bitpos=0, ....)'
now done, as pr_debug_n, pr_debug in printk.h
Ive adapted the macros with a "_cl(cl, " insertion,
also added trailing prcls to control output
>
> - no way to exersize new code in ddebug_change
> need pr_debug_typed() to make a (not-null) typed callsite.
> also no way to set module->debugflags
close enough to see the thinkos
next prev parent reply other threads:[~2020-06-12 0:09 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-09 10:45 [PATCH v3 0/7] Venus dynamic debug Stanimir Varbanov
2020-06-09 10:45 ` [PATCH v3 1/7] Documentation: dynamic-debug: Add description of level bitmask Stanimir Varbanov
2020-06-09 11:09 ` Matthew Wilcox
2020-06-09 11:16 ` Greg Kroah-Hartman
2020-06-09 16:58 ` Joe Perches
2020-06-09 17:42 ` Edward Cree
2020-06-09 17:56 ` Joe Perches
2020-06-09 18:08 ` Edward Cree
2020-06-10 6:31 ` Greg Kroah-Hartman
2020-06-10 6:35 ` Joe Perches
2020-06-10 7:09 ` Greg Kroah-Hartman
2020-06-10 7:24 ` Joe Perches
2020-06-10 10:29 ` Stanimir Varbanov
2020-06-10 12:26 ` Greg Kroah-Hartman
2020-06-09 10:45 ` [PATCH v3 2/7] dynamic_debug: Group debug messages by " Stanimir Varbanov
2020-06-09 12:27 ` Petr Mladek
2020-06-09 10:46 ` [PATCH v3 3/7] dev_printk: Add dev_dbg_level macro over dynamic one Stanimir Varbanov
2020-06-09 10:46 ` [PATCH v3 4/7] printk: Add pr_debug_level " Stanimir Varbanov
2020-06-09 11:12 ` Greg Kroah-Hartman
2020-06-09 10:46 ` [PATCH v3 5/7] venus: Add debugfs interface to set firmware log level Stanimir Varbanov
2020-06-09 11:12 ` Greg Kroah-Hartman
2020-06-11 11:51 ` Stanimir Varbanov
2020-06-09 10:46 ` [PATCH v3 6/7] venus: Make debug infrastructure more flexible Stanimir Varbanov
2020-06-09 11:14 ` Greg Kroah-Hartman
2020-06-10 13:29 ` Stanimir Varbanov
2020-06-10 13:37 ` Greg Kroah-Hartman
2020-06-10 19:49 ` Joe Perches
2020-06-10 20:23 ` Joe Perches
2020-06-11 6:26 ` Greg Kroah-Hartman
2020-06-11 6:42 ` Joe Perches
2020-06-11 10:52 ` Daniel Thompson
2020-06-11 11:31 ` Stanimir Varbanov
2020-06-11 12:18 ` Daniel Thompson
2020-06-11 21:19 ` jim.cromie
2020-06-11 21:59 ` Jason Baron
2020-06-11 22:33 ` Joe Perches
2020-06-12 0:08 ` jim.cromie [this message]
2020-06-10 18:32 ` WIP generic module->debug_flags and dynamic_debug jim.cromie
2020-06-10 20:24 ` Joe Perches
2020-06-11 11:26 ` Rasmus Villemoes
2020-06-11 14:09 ` jim.cromie
2020-06-09 10:46 ` [PATCH v3 7/7] venus: Add a debugfs file for SSR trigger Stanimir Varbanov
2020-06-09 11:13 ` [PATCH v3 0/7] Venus dynamic debug Matthew Wilcox
2020-06-09 16:03 ` Randy Dunlap
2020-06-09 16:49 ` Joe Perches
2020-06-09 21:21 ` jim.cromie
2020-06-09 22:23 ` Joe Perches
2020-06-10 1:58 ` Joe Perches
2020-06-10 3:10 ` jim.cromie
2020-06-09 16:40 ` Joe Perches
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