Re: [PATCH 0/9] Support follow_link in RCU-walk.

2015-03-08 Thread NeilBrown
On Thu, 5 Mar 2015 06:05:20 + Al Viro wrote: > On Thu, Mar 05, 2015 at 04:21:21PM +1100, NeilBrown wrote: > > Hi Al (and others), > > > > I wonder if you could look over this patchset. > > It allows RCU-walk to follow symlinks in many common cases, > > thus removing a surprising

Re: [PATCH 0/9] Support follow_link in RCU-walk.

2015-03-08 Thread NeilBrown
On Thu, 5 Mar 2015 06:05:20 + Al Viro v...@zeniv.linux.org.uk wrote: On Thu, Mar 05, 2015 at 04:21:21PM +1100, NeilBrown wrote: Hi Al (and others), I wonder if you could look over this patchset. It allows RCU-walk to follow symlinks in many common cases, thus removing a

Re: [PATCH 0/9] Support follow_link in RCU-walk.

2015-03-05 Thread NeilBrown
On Thu, 5 Mar 2015 06:05:20 + Al Viro wrote: > On Thu, Mar 05, 2015 at 04:21:21PM +1100, NeilBrown wrote: > > Hi Al (and others), > > > > I wonder if you could look over this patchset. > > It allows RCU-walk to follow symlinks in many common cases, > > thus removing a surprising

Re: [PATCH 0/9] Support follow_link in RCU-walk.

2015-03-05 Thread John Stoffel
> "Al" == Al Viro writes: Al> On Thu, Mar 05, 2015 at 08:52:20AM -0500, John Stoffel wrote: >> So what happens if your filesystem is 10Tb in size, and you have 50 >> million files and lots of them are symlinks? I've got developers who >> do shit like this and wonder why performance

Re: [PATCH 0/9] Support follow_link in RCU-walk.

2015-03-05 Thread Al Viro
On Thu, Mar 05, 2015 at 08:52:20AM -0500, John Stoffel wrote: > So what happens if your filesystem is 10Tb in size, and you have 50 > million files and lots of them are symlinks? I've got developers who > do shit like this and wonder why performance sucks and I just > worry that GPF_KERNEL

Re: [PATCH 0/9] Support follow_link in RCU-walk.

2015-03-05 Thread John Stoffel
> "Al" == Al Viro writes: Al> On Thu, Mar 05, 2015 at 04:21:21PM +1100, NeilBrown wrote: >> Hi Al (and others), >> >> I wonder if you could look over this patchset. >> It allows RCU-walk to follow symlinks in many common cases, >> thus removing a surprising performance hit caused by using

Re: [PATCH 0/9] Support follow_link in RCU-walk.

2015-03-05 Thread NeilBrown
On Thu, 5 Mar 2015 06:05:20 + Al Viro v...@zeniv.linux.org.uk wrote: On Thu, Mar 05, 2015 at 04:21:21PM +1100, NeilBrown wrote: Hi Al (and others), I wonder if you could look over this patchset. It allows RCU-walk to follow symlinks in many common cases, thus removing a

Re: [PATCH 0/9] Support follow_link in RCU-walk.

2015-03-05 Thread John Stoffel
Al == Al Viro v...@zeniv.linux.org.uk writes: Al On Thu, Mar 05, 2015 at 08:52:20AM -0500, John Stoffel wrote: So what happens if your filesystem is 10Tb in size, and you have 50 million files and lots of them are symlinks? I've got developers who do shit like this and wonder why performance

Re: [PATCH 0/9] Support follow_link in RCU-walk.

2015-03-05 Thread Al Viro
On Thu, Mar 05, 2015 at 08:52:20AM -0500, John Stoffel wrote: So what happens if your filesystem is 10Tb in size, and you have 50 million files and lots of them are symlinks? I've got developers who do shit like this and wonder why performance sucks and I just worry that GPF_KERNEL is a

Re: [PATCH 0/9] Support follow_link in RCU-walk.

2015-03-05 Thread John Stoffel
Al == Al Viro v...@zeniv.linux.org.uk writes: Al On Thu, Mar 05, 2015 at 04:21:21PM +1100, NeilBrown wrote: Hi Al (and others), I wonder if you could look over this patchset. It allows RCU-walk to follow symlinks in many common cases, thus removing a surprising performance hit caused by

Re: [PATCH 0/9] Support follow_link in RCU-walk.

2015-03-04 Thread Al Viro
On Thu, Mar 05, 2015 at 04:21:21PM +1100, NeilBrown wrote: > Hi Al (and others), > > I wonder if you could look over this patchset. > It allows RCU-walk to follow symlinks in many common cases, > thus removing a surprising performance hit caused by using symlinks. > > The last could of

Re: [PATCH 0/9] Support follow_link in RCU-walk.

2015-03-04 Thread Al Viro
On Thu, Mar 05, 2015 at 04:21:21PM +1100, NeilBrown wrote: Hi Al (and others), I wonder if you could look over this patchset. It allows RCU-walk to follow symlinks in many common cases, thus removing a surprising performance hit caused by using symlinks. The last could of patches make