lkml.org 
[lkml]   [2015]   [Sep]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: + zsmalloc-add-comments-for-inuse-to-zspage.patch added to -mm tree
On (09/23/15 14:53), akpm@linux-foundation.org wrote:
> ------------------------------------------------------
> From: Hui Zhu <zhuhui@xiaomi.com>
> Subject: zsmalloc: add comments for ->inuse to zspage
>
> Signed-off-by: Hui Zhu <zhuhui@xiaomi.com>
> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
> Cc: Dan Streetman <ddstreet@ieee.org>
> Cc: Minchan Kim <minchan@kernel.org>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> ---
>
> mm/zsmalloc.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff -puN mm/zsmalloc.c~zsmalloc-add-comments-for-inuse-to-zspage mm/zsmalloc.c
> --- a/mm/zsmalloc.c~zsmalloc-add-comments-for-inuse-to-zspage
> +++ a/mm/zsmalloc.c
> @@ -38,6 +38,7 @@
> * page->lru: links together first pages of various zspages.
> * Basically forming list of zspages in a fullness group.
> * page->mapping: class index and fullness group of the zspage
> + * page->inuse: the pages number that is used in this zspage

Probably arrived last night to my another mailbox, so haven't
seen this one.


The comment is wrong. page ->inuse represents the number of objects
in use in this zspage; not "the pages number".

usage example:

zspage_full() : page->inuse == page->objects
obj_malloc() : first_page->inuse++
obj_free() : first_page->inuse--

-ss


\
 
 \ /
  Last update: 2015-09-24 06:21    [W:0.076 / U:0.424 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site