From: Petr Mladek <pmladek@suse.com>
To: jim.cromie@gmail.com
Cc: Jason Baron <jbaron@akamai.com>,
LKML <linux-kernel@vger.kernel.org>,
akpm@linuxfoundation.org, Greg KH <gregkh@linuxfoundation.org>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Jonathan Corbet <corbet@lwn.net>,
Andrew Morton <akpm@linux-foundation.org>,
Will Deacon <will@kernel.org>, Orson Zhai <orson.zhai@unisoc.com>,
Linux Documentation List <linux-doc@vger.kernel.org>
Subject: Re: [PATCH v3 20/21] dyndbg: add user-flag, negating-flags, and filtering on flags
Date: Fri, 19 Jun 2020 10:10:24 +0200 [thread overview]
Message-ID: <20200619081024.GG3617@alley> (raw)
In-Reply-To: <20200619074555.GF3617@alley>
On Fri 2020-06-19 09:45:55, Petr Mladek wrote:
> On Thu 2020-06-18 13:11:05, jim.cromie@gmail.com wrote:
> > On Thu, Jun 18, 2020 at 12:17 PM Jason Baron <jbaron@akamai.com> wrote:
> > > Yes, I'm wondering as well if people are really going to use the
> > > new flags and filter flags - I mentioned that here:
> > > https://lkml.org/lkml/2020/6/12/732
> >
> > yes, I saw, and replied there.
>
> No, the repply only explains how the interface might be used. There is
> no prove that people would actually use it.
>
> > but since that was v1, and we're on v3, we should refresh.
> >
> > the central use-case is above, 1-liner version summarized here:
> >
> > 1- enable sites as you chase a problem with +up
> > 2- examine them with grep =pu
> > 3- change the set to suit, either by adding or subtracting callsites.
> > 4- continue debugging, and changing callsites to suit
> > 5- grep =pu control > ~/debugging-session-task1-callsites
> > 6- echo up-p >control # disable for now, leave u-set for later
> > 7- do other stuff
> > 8 echo uP+p >control # reactivate useful debug-state and resume
>
> In short, this feature allows repeatedly enable/disable some
> slowly growing maze of debug messages. Who need this, please? !!!
>
> If I am debugging then I add/remove debug messages. But I never
> enable/disable all of them repeatedly.
Not to say that I usually need to reboot when I reproduce the problem
and before I could try it again. So all dyndbg flags gets lost
between two tests anyway.
Best Regards,
Petr
next prev parent reply other threads:[~2020-06-19 8:11 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-17 16:25 [PATCH v3 00/21] dynamic_debug cleanups, query features, export Jim Cromie
2020-06-17 16:25 ` [PATCH v3 01/21] dyndbg-docs: eschew file /full/path query in docs Jim Cromie
2020-06-17 16:25 ` [PATCH v3 02/21] dyndbg-docs: initialization is done early, not arch Jim Cromie
2020-06-17 16:25 ` [PATCH v3 03/21] dyndbg: drop obsolete comment on ddebug_proc_open Jim Cromie
2020-06-17 16:25 ` [PATCH v3 04/21] dyndbg: refine debug verbosity; 1 is basic, 2 more chatty Jim Cromie
2020-06-17 16:25 ` [PATCH v3 05/21] dyndbg: rename __verbose section to __dyndbg Jim Cromie
2020-06-17 16:25 ` [PATCH v3 06/21] dyndbg: fix overcounting of ram used by dyndbg Jim Cromie
2020-06-17 16:25 ` [PATCH v3 07/21] dyndbg: fix a BUG_ON in ddebug_describe_flags Jim Cromie
2020-06-17 16:25 ` [PATCH v3 08/21] dyndbg: fix pr_err with empty string Jim Cromie
2020-06-17 16:25 ` [PATCH v3 09/21] dyndbg: prefer declarative init in caller, to memset in callee Jim Cromie
2020-06-17 16:25 ` [PATCH v3 10/21] dyndbg: make ddebug_tables list LIFO for add/remove_module Jim Cromie
2020-06-17 16:25 ` [PATCH v3 11/21] dyndbg: use gcc ?: to reduce word count Jim Cromie
2020-06-17 16:25 ` [PATCH v3 12/21] dyndbg: refactor parse_linerange out of ddebug_parse_query Jim Cromie
2020-06-17 16:25 ` [PATCH v3 13/21] dyndbg: accept 'file foo.c:func1' and 'file foo.c:10-100' Jim Cromie
2020-06-17 16:25 ` [PATCH v3 14/21] dyndbg: accept query terms like file=bar and module=foo Jim Cromie
2020-06-18 22:25 ` jim.cromie
2020-06-17 16:25 ` [PATCH v3 14/21] dyndbg: accept query terms like file=bar module=foo Jim Cromie
2020-06-17 16:25 ` [PATCH v3 14/21] dyndbg: accept query terms like module:foo and file=bar Jim Cromie
2020-06-17 16:25 ` [PATCH v3 15/21] dyndbg: export ddebug_exec_queries Jim Cromie
2020-06-17 16:25 ` [PATCH v3 16/21] dyndbg: combine flags & mask into a struct, simplify with it Jim Cromie
2020-06-17 16:25 ` [PATCH v3 17/21] dyndbg: refactor ddebug_read_flags out of ddebug_parse_flags Jim Cromie
2020-06-17 16:25 ` [PATCH v3 18/21] dyndbg: add filter channel to the internals Jim Cromie
2020-06-17 16:25 ` [PATCH v3 19/21] dyndbg: extend ddebug_parse_flags to accept optional leading filter-flags Jim Cromie
2020-06-18 12:44 ` Petr Mladek
2020-06-18 14:54 ` jim.cromie
2020-06-18 16:01 ` Petr Mladek
2020-06-17 16:25 ` [PATCH v3 20/21] dyndbg: add user-flag, negating-flags, and filtering on flags Jim Cromie
2020-06-17 22:13 ` Joe Perches
2020-06-17 22:57 ` jim.cromie
2020-06-18 16:19 ` Petr Mladek
2020-06-18 17:40 ` Petr Mladek
2020-06-18 18:17 ` Jason Baron
2020-06-18 19:11 ` jim.cromie
2020-06-18 19:40 ` Jason Baron
2020-06-18 21:31 ` jim.cromie
2020-06-18 22:34 ` Stanimir Varbanov
2020-06-18 22:48 ` jim.cromie
2020-06-19 16:07 ` Jason Baron
2020-06-19 7:45 ` Petr Mladek
2020-06-19 8:10 ` Petr Mladek [this message]
2020-06-19 8:34 ` Greg KH
2020-06-18 18:15 ` jim.cromie
2020-06-17 16:25 ` [PATCH v3 21/21] dyndbg: allow negating flag-chars in modifier flags Jim Cromie
2020-06-17 20:05 ` [PATCH v3 00/21] dynamic_debug cleanups, query features, export Rasmus Villemoes
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