lkml.org 
[lkml]   [2006]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] Fix do_mlock so page alignment is to hugepage boundries when needed
On Wed, 17 May 2006, Eric Paris wrote:
>
> This patch still solves the problem of the kernel currently being more
> restrictive on what we accept from userspace for the length of the mlock
> if it is a hugepage rather than a regular page. With a regular page we
> will round the value from userspace and happily go about our business of
> mlocking. For a hugepage it just rejects it if userspace doesn't align
> it themselves. This allows the kernel to do the same work for hugepages
> that it does for normal pages.

You do have a point that there's an inconsistency there. But we could
argue a long time what's inconsistent with what - I'd say it's mlock
being inconsistent with mprotect, munmap, msync, madvise, etc. I
don't see an outright reason to change from the current behaviour.

You do realize that there's almost no point in mlocking a hugepage area
anyway? (I wrote that first without the "almost", but now with hugepage
faulting, it does provide another way to fault in all the pages at once.)

Hugh
-
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: 2006-05-18 13:16    [W:0.038 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site