linux-kernel - Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless update of refcount

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CA+55aFzBBADPxK3mJrKt2Qx-y-VJjk9fOrN6A0YRPrujXBNeQg@mail.gmail.com>
Date:	Sun, 1 Sep 2013 08:55:56 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Sedat Dilek <sedat.dilek@...il.com>
Cc:	Waiman Long <waiman.long@...com>, Ingo Molnar <mingo@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jeff Layton <jlayton@...hat.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andi Kleen <andi@...stfloor.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Norton, Scott J" <scott.norton@...com>
Subject: Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless
 update of refcount

On Sun, Sep 1, 2013 at 8:45 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> Samples: 160K of event 'cycles:pp', Event count (approx.): 77003901089
> +  12,46%  t_lockref_from-  [kernel.kallsyms]     [k] irq_return
> +   4,86%  t_lockref_from-  [kernel.kallsyms]     [k] lockref_get_or_lock
> +   4,42%  t_lockref_from-  [kernel.kallsyms]     [k] __ticket_spin_lock
> +   4,28%  t_lockref_from-  [kernel.kallsyms]     [k] __acct_update_integrals

You need to go into __ticket_spin_lock to see who the callers are.

Just go down to it and press enter to expand it (and then you need to
go and expand that entry too to get the callers)

I still don't know how you get to irq_return. It should use sysret. Odd.

            Linus
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/