From: Jun Sun <jsun@mvista.com>
To: "Sirotkin, Alexander" <demiurg@ti.com>
Cc: linux-mips@linux-mips.org, jsun@mvista.com
Subject: Re: tasklet latency and system calls on mips
Date: Thu, 14 Aug 2003 09:45:15 -0700 [thread overview]
Message-ID: <20030814094515.B1203@mvista.com> (raw)
In-Reply-To: <3F3B53C0.30408@ti.com>; from demiurg@ti.com on Thu, Aug 14, 2003 at 12:17:52PM +0300
On Thu, Aug 14, 2003 at 12:17:52PM +0300, Sirotkin, Alexander wrote:
>
> I suspect that what happens is as follows :
>
> system call arrives and while it's being processed and interrupt to one
> of the drivers arrives. This interrupt
> schedules a tasklet which however is not executed after the system call
> finishes,
The tasklet should be executed at the return of interrupt handling.
If not, there is a bug.
> only after the next timer
> interrupt which causes up to 10 ms latency (not all the time, only when
> somebody makes a system call).
>
BTW, make sure tasklet_schedule() is indeed called in an interrupt handler.
I am not sure why will happen otherwise.
If you suspect it is a bug, you can easily trace them. You may my
little tracing tool useful,
http://linux.junsun.net/patches/generic/experimental/030716.a-jstrace.patch
Jun
next prev parent reply other threads:[~2003-08-14 16:45 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-13 13:46 tasklet latency and system calls on mips Sirotkin, Alexander
2003-08-13 16:54 ` Jun Sun
2003-08-14 9:17 ` Sirotkin, Alexander
2003-08-14 16:45 ` Jun Sun [this message]
2003-08-18 15:29 ` Sirotkin, Alexander
2003-08-18 17:08 ` Jun Sun
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=20030814094515.B1203@mvista.com \
--to=jsun@mvista.com \
--cc=demiurg@ti.com \
--cc=linux-mips@linux-mips.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.