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
| ||
|
Date: Mon, 27 Nov 2006 14:01:31 -0800 From: Andrew Morton <akpm@...l.org> To: Eric Dumazet <dada1@...mosbay.com> Cc: linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] fs : reorder some 'struct inode' fields to speedup i_size manipulations On Mon, 27 Nov 2006 22:52:04 +0100 Eric Dumazet <dada1@...mosbay.com> wrote: > > I didn't understand that paragraph at all, really, so I took it out. > > > > At present an i_size change will dirty one, two or three cachelines, most > > likely one or two. > > > > After your patch an i_size change will dirty one or two cachelines, most > > likely one. > > > > yes? > > nope > > Before : > --------- > offsetof(i_size) = 0x3C > > i_size is 8 bytes, so i_size spans 2 cache lines (if 64 or 32 bytes cache lines) This all depends on the offset of the inode, and you don't know what that is. offsetof(ext3_inode_info, vfs_inode) != offsetof(nfs_inode, vfs_inode), etc. - 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/
Powered by blists - more mailing lists