linux-kernel - Re: [PACTH v2 0/3] Implement /proc/<pid>/totmaps

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Message-ID: <20160814090430.GB9248@dhcp22.suse.cz>
Date:	Sun, 14 Aug 2016 11:04:31 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	robert.foss@...labora.com
Cc:	corbet@....net, akpm@...ux-foundation.org, vbabka@...e.cz,
	koct9i@...il.com, hughd@...gle.com, n-horiguchi@...jp.nec.com,
	minchan@...nel.org, john.stultz@...aro.org,
	ross.zwisler@...ux.intel.com, jmarchan@...hat.com,
	hannes@...xchg.org, keescook@...omium.org, viro@...iv.linux.org.uk,
	gorcunov@...nvz.org, plaguedbypenguins@...il.com,
	rientjes@...gle.com, eric.engestrom@...tec.com, jdanis@...gle.com,
	calvinowens@...com, adobriyan@...il.com, jann@...jh.net,
	sonnyrao@...omium.org, kirill.shutemov@...ux.intel.com,
	ldufour@...ux.vnet.ibm.com, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Ben Zhang <benzh@...omium.org>,
	Bryan Freed <bfreed@...omium.org>,
	Filipe Brandenburger <filbranden@...omium.org>,
	Mateusz Guzik <mguzik@...hat.com>
Subject: Re: [PACTH v2 0/3] Implement /proc/<pid>/totmaps

On Fri 12-08-16 18:04:19, robert.foss@...labora.com wrote:
> From: Robert Foss <robert.foss@...labora.com>
> 
> This series implements /proc/PID/totmaps, a tool for retrieving summarized
> information about the mappings of a process.

The changelog is absolutely missing the usecase. Why do we need this?
Why existing interfaces are not sufficient?

> Changes since v1:
> - Removed IS_ERR check from get_task_mm() function
> - Changed comment format
> - Moved proc_totmaps_operations declaration inside internal.h
> - Switched to using do_maps_open() in totmaps_open() function,
>   which provides privilege checking
> - Error handling reworked for totmaps_open() function
> - Switched to stack allocated struct mem_size_stats mss_sum in
>   totmaps_proc_show() function
> - Removed get_task_mm() in totmaps_proc_show() since priv->mm
>   already is available
> - Added support to proc_map_release() fork priv==NULL, to allow
>   function to be used for all failure cases
> - Added proc_totmaps_op and for it helper functions
> - Added documention in separate patch
> - Removed totmaps_release() since it was just a wrapper for
>   proc_map_release()
> 
> 
> Robert Foss (3):
>   mm, proc: Implement /proc/<pid>/totmaps
>   Documentation/filesystems: Fixed typo
>   Documentation/filesystems: Added /proc/PID/totmaps documentation
> 
>  Documentation/filesystems/proc.txt |  23 ++++++-
>  fs/proc/base.c                     |   1 +
>  fs/proc/internal.h                 |   3 +
>  fs/proc/task_mmu.c                 | 134 +++++++++++++++++++++++++++++++++++++
>  4 files changed, 160 insertions(+), 1 deletion(-)
> 
> -- 
> 2.7.4
> 

-- 
Michal Hocko
SUSE Labs