lkml.org 
[lkml]   [2007]   [Mar]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
DateTue, 6 Mar 2007 14:47:46 +0000
FromChristoph Hellwig <>
SubjectRe: [RFC] Heads up on sys_fallocate()
On Tue, Mar 06, 2007 at 06:36:09AM -0800, Ulrich Drepper wrote:
> Christoph Hellwig wrote:
> > fallocate with the whence argument and flags is already quite complicated,
> > I'd rather have another call for placement decisions, that would
> > be called on an fd to do placement decissions for any further allocations
> > (prealloc, write, etc)
>
> Yes, posix_fallocate shouldn't be made more complicated. But I don't
> understand why requesting linear layout of the blocks should be an
> option. It's always an advantage if the blocks requested this way are
> linear on disk. So, the kernel should always do its best to make this
> happen, without needing an additional option.

There are HPC workloads where you have multi writers on multiple machines
that write to different parts of a file. You preferably want each
of those regions in separate allocation groups. (Or tell the customers
to use separate files for the regions..)
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-03-06 15:51    [from the cache]
©2003-2010