| 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
| ||
|
Message-ID: <AANLkTimrqb5e9QKT7UFLXtQHap689kSoEZRmLvax5Xm-@mail.gmail.com> Date: Wed, 12 Jan 2011 00:06:42 +1100 From: Nick Piggin <npiggin@...il.com> To: Nick Piggin <npiggin@...il.com>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: Important for fs devs: rcu-walk merged upstream On Tuesday, January 11, 2011, Joel Becker <jlbec@...lplan.org> wrote: > On Sat, Jan 08, 2011 at 01:54:47PM +1100, Nick Piggin wrote: >> The rcu-walk stuff can be more tricky for your filesystem >> to take advantage of. >> >> If you supply a .d_revalidate, .permission, or .check_acl, >> then path walking is going to be slow and unscalable for >> you. > > Do you mean "as slow and unscalable as it has always been" or > "even slower now"? A quick look suggests the former, but I wanted to be > sure. Yeah it should be about the same. Bit more complex code so it might be a bit slower. A few code and branch and cache improvements so it might be a bit faster. Refcounts on the same dentry become a bit less scalable for using lock instead of atomic. On the other hand dropping the ref on leaf denty doesn't require global lock. It should not be urgent for 2.6.38. -- 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