From: David Smith <dsmith@redhat.com>
To: Shiyao Ma <i@introo.me>
Cc: systemtap@sourceware.org
Subject: Re: Is it ok to insert a module multiple times with staprun?
Date: Fri, 31 Mar 2017 15:40:00 -0000 [thread overview]
Message-ID: <CAKFOr-bzF8Tb2Wtf=Q=761JgmLaVaexOZy8jW+V4h-2jkOqw6g@mail.gmail.com> (raw)
In-Reply-To: <CAKFOr-a+j4an-YhDT4shSwjZnduPsi4fxyJCmX9rNVXBRjVwmg@mail.gmail.com>
On Fri, Mar 31, 2017 at 9:50 AM, David Smith <dsmith@redhat.com> wrote:
> On Thu, Mar 30, 2017 at 10:51 PM, Shiyao Ma <i@introo.me> wrote:
OK, I had another sneaky thought here. You could use the system()
function to copy the config file to the /proc file. I haven't had time
to test this, but in theory something like this should work:
====
global config_done
probe procfs.write("config")
{
# process $value here
config_done = 1
}
probe kernel.function("vfs_read") if (config_done)
{
# real processing here...
}
probe begin
{
system(sprintf("cat config > /proc/systemtap/%s/config", module_name()))
}
====
--
David Smith
dsmith@redhat.com
Red Hat
http://www.redhat.com
256.217.0141 (direct)
256.837.0057 (fax)
next prev parent reply other threads:[~2017-03-31 15:40 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-30 4:41 Shiyao Ma
2017-03-30 5:40 ` Arkady
[not found] ` <e7f616ba-eb90-47ee-b784-ea02fdf519ff@Spark>
2017-03-30 8:22 ` Arkady
2017-03-30 14:53 ` David Smith
2017-03-31 3:51 ` Shiyao Ma
2017-03-31 4:08 ` Arkady
2017-03-31 14:50 ` David Smith
2017-03-31 15:40 ` David Smith [this message]
2017-03-31 15:46 ` Shiyao Ma
2017-04-01 6:15 ` Shiyao Ma
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