From: Ingo Molnar <mingo@elte.hu>
To: "Paul E. McKenney" <paulmck@us.ibm.com>
Cc: linux-kernel@vger.kernel.org, tytso@us.ibm.com,
sripathi@in.ibm.com, dipankar@in.ibm.com, oleg@tv-sign.ru
Subject: Re: [RFC,PATCH] RCUify single-thread case of clock_gettime()
Date: Mon, 31 Oct 2005 22:44:49 +0100 [thread overview]
Message-ID: <20051031214449.GB17489@elte.hu> (raw)
In-Reply-To: <20051031174416.GA2762@us.ibm.com>
* Paul E. McKenney <paulmck@us.ibm.com> wrote:
> Hello!
>
> The attached patch uses RCU to avoid the need to acquire tasklist_lock
> in the single-thread case of clock_gettime(). Still acquires
> tasklist_lock when asking for the time of a (potentially
> multithreaded) process.
>
> Experimental, has been touch-tested on x86 and POWER. Requires RCU on
> task_struct. Further more focused testing in progress.
>
> Thoughts? (Why? Some off-list users want to be able to monitor CPU
> consumption of specific threads. They need to do so quite frequently,
> so acquiring tasklist_lock is inappropriate.)
looks good to me - i have added this to the -rt tree, it should show up
in 2.6.14-rt3.
Ingo
prev parent reply other threads:[~2005-10-31 21:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-31 17:44 Paul E. McKenney
2005-10-31 18:08 ` Hugh Dickins
2005-10-31 19:54 ` Ingo Molnar
2005-10-31 20:07 ` Hugh Dickins
2005-10-31 21:50 ` Ingo Molnar
2005-10-31 19:37 ` Joe Seigh
2005-10-31 21:44 ` Ingo Molnar [this message]
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=20051031214449.GB17489@elte.hu \
--to=mingo@elte.hu \
--cc=dipankar@in.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=oleg@tv-sign.ru \
--cc=paulmck@us.ibm.com \
--cc=sripathi@in.ibm.com \
--cc=tytso@us.ibm.com \
/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
all inboxes | Powered by JetHome®