From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx160.postini.com [74.125.245.160]) by kanga.kvack.org (Postfix) with SMTP id 6FC926B005D for ; Thu, 11 Oct 2012 09:45:12 -0400 (EDT) Subject: Re: kswapd0: wxcessive CPU usage In-Reply-To: Your message of "Thu, 11 Oct 2012 10:52:28 +0200." <507688CC.9000104@suse.cz> From: Valdis.Kletnieks@vt.edu References: <507688CC.9000104@suse.cz> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1349963080_1985P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Thu, 11 Oct 2012 09:44:40 -0400 Message-ID: <106695.1349963080@turing-police.cc.vt.edu> Sender: owner-linux-mm@kvack.org List-ID: To: Jiri Slaby Cc: linux-mm@kvack.org, LKML , Jiri Slaby --==_Exmh_1349963080_1985P Content-Type: text/plain; charset="us-ascii" Content-Id: <106687.1349963080.1@turing-police.cc.vt.edu> On Thu, 11 Oct 2012 10:52:28 +0200, Jiri Slaby said: > Hi, > > with 3.6.0-next-20121008, kswapd0 is spinning my CPU at 100% for 1 > minute or so. > [] ? put_super+0x25/0x40 > [] ? grab_super_passive+0x24/0xa0 > [] ? prune_super+0x149/0x1b0 > [] ? shrink_slab+0xa1/0x2d0 > [] ? kswapd+0x66d/0xb60 > [] ? try_to_free_pages+0x180/0x180 > [] ? kthread+0xc0/0xd0 > [] ? kthread_create_on_node+0x130/0x130 > [] ? ret_from_fork+0x7c/0x90 > [] ? kthread_create_on_node+0x130/0x130 I don't know what it is, I haven't finished bisecting it - but I can confirm that I started seeing the same problem 2 or 3 weeks ago. Note that said call trace does *NOT* require a suspend - I don't do suspend on my laptop and I'm seeing kswapd burn CPU with similar traces. # cat /proc/31/stack [] grab_super_passive+0x44/0x76 [] prune_super+0x3a/0x13c [] shrink_slab+0x95/0x301 [] kswapd+0x5c8/0x902 [] kthread+0x9d/0xa5 [] ret_from_fork+0x7c/0x90 [] 0xffffffffffffffff # cat /proc/31/stack [] put_super+0x29/0x2d [] drop_super+0x1b/0x20 [] prune_super+0x12a/0x13c [] shrink_slab+0x95/0x301 [] kswapd+0x5c8/0x902 [] kthread+0x9d/0xa5 [] ret_from_fork+0x7c/0x90 [] 0xffffffffffffffff So at least we know we're not hallucinating. :) --==_Exmh_1349963080_1985P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iQIVAwUBUHbNSAdmEQWDXROgAQIYfBAAgeHEAz7FgfpzNDpcV4yZGL2B+VHPHovO Y8TjqAVUB4YEVt7NV215wuh2hX+W21ycqdw6yIJZKipP680Qi+MN+8KO9ayie1nQ yrE/SDPlGzZjZyKctRLrKKV/GLcw8H9TsVNC46L7s1OyguW9GBS+7KMg2LBIRY6A LDoutg1c2WrFp9EmeGOy2tvSmmSjjC08hUvezQwP7POtX7iDdjcTjvuoX9KwZErL EoyzU32Kehwh6xjVTipAd1glIsjR/qeR9EsVBY2yNJN+jUEouF6TYIpod0zumujo RNTkBYY5KlCd0lJJ924wqP9+YyTM9GoGfgCyvOA8uVQdVwrtYv04PF2szLGqDGSE xk8G189iE/K1RsMFXvWOnXkHfylf5H4eveTYSWLvDZXr4c8rvQASosTi/u6Qwaa+ 3hC30YoHe5Jps+fD3eY3vZeevo+KGrULq0p6bfNOOcMBARFkb5lViytI0RHSfEZM uBSyBD67vHEQ0FKskyqyugTJPjoh3clFzedJTbsadYY7mi3b52t8TSjcYCJfBDhj hwCDf9rSNLbyvWoJviz3P2MmqgvnDHrX7zX5h6z+iBxnJPZHT3FnwfrrokF3Pk50 HOME2lvw8oz/Je96tALRIWeJ4GzfIeA9F1ZIUGhTIP1fSJqvRuf6QdQrZJ3VM4V+ 8vhVI9NXC+g= =bkF7 -----END PGP SIGNATURE----- --==_Exmh_1349963080_1985P-- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org