linux-kernel - Re: How to use perf to log page faults

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: <8739xwvq8o.fsf@basil.nowhere.org>
Date:	Wed, 12 May 2010 22:07:03 +0200
From:	Andi Kleen <andi@...obates.de>
To:	Taras Glek <tglek@...illa.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: How to use perf to log page faults

Taras Glek <tglek@...illa.com> writes:

> Hi,
> From the docs it seems that perf may be useful for logging page
> faults. I tried
> perf record -g -d -f -e page-faults <mycommand>
> but all I got were PERF_RECORD_MMAP events.
>
> I'm using 2.6.32. Ideally I'd like to collect fault addresses and
> userspace stacks that caused them. Isn't this what the page-fault
> event is for?

Some time ago I used systemtap to do this for my pbitmaps
works. This was the old systemtap script.

-Andi

probe vm.pagefault  { 
	if (task_execname(task_current()) == "executable" && address < 0x100000000) { 
		printf("%u\n", address); 
	}

} 



-- 
ak@...ux.intel.com -- Speaking for myself only.
--
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/