Re: [PATCH] madvise.2: madvise(, , MADV_REMOVE) supports ext4, ocfs2 and xfs as well

[Jan Chaloupka <jchaloup-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

ping

On 10/07/2014 04:03 PM, Jan Chaloupka wrote:
> As from upstream commit:
>
> commit 3f31d07571eeea18a7d34db9af21d2285b807a17
> Author: Hugh Dickins <hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
> Date:   Tue May 29 15:06:40 2012 -0700
>
>      mm/fs: route MADV_REMOVE to FALLOC_FL_PUNCH_HOLE
>
>      Now tmpfs supports hole-punching via fallocate(), switch madvise_remove()
>      to use do_fallocate() instead of vmtruncate_range(): which extends
>      madvise(,,MADV_REMOVE) support from tmpfs to ext4, ocfs2 and xfs.
>
> madvise(,,MADV_REMOVE) support was extended by ext4, ocfs2 and xfs.
>
> bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1120294
>
> Justification from Rafael Aquini:
> Well, that code is committed in kernel since v3.5 (2012) and it surely is
> the expected behaviour since. It seems to me that madvise(2) man page text
> for MADV_REMOVE just got out-of-date in that regard.
>
> This patch mentions this support in madvise.2 man page.
>
> Signed-off-by: Jan Chaloupka <jchaloup-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>   man2/madvise.2 |    4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/man2/madvise.2 b/man2/madvise.2
> index 032ead7..44698ec 100644
> --- a/man2/madvise.2
> +++ b/man2/madvise.2
> @@ -98,12 +98,12 @@ either in reloading of the memory contents from the underlying mapped file
>   or zero-fill-on-demand pages for mappings
>   without an underlying file.
>   .TP
> -.BR MADV_REMOVE " (since Linux 2.6.16)"
> +.BR MADV_REMOVE " (since Linux 3.5)"
>   Free up a given range of pages
>   and its associated backing store.
>   Currently,
>   .\" 2.6.18-rc5
> -only shmfs/tmpfs supports this; other filesystems return with the
> +only shmfs/tmpfs, ext4, ocfs2 and xfs supports this; other filesystems return with the
>   error
>   .BR ENOSYS .
>   .\" Databases want to use this feature to drop a section of their
>

-- 
Jan Chaloupka
------------------------------
* Software Engineer          *
* ENG Base Operating Systems *
* Red Hat Czech, s. r. o.    *
* UTC+1 (CET), jchaloup      *

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