linux-kernel - Re: [PATCH V2 6/7] proc: show MADV

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Date:   Fri, 10 Feb 2017 14:30:40 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Shaohua Li <shli@...com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Kernel-team@...com, danielmicay@...il.com, minchan@...nel.org,
        hughd@...gle.com, hannes@...xchg.org, riel@...hat.com,
        mgorman@...hsingularity.net, akpm@...ux-foundation.org
Subject: Re: [PATCH V2 6/7] proc: show MADV_FREE pages info in smaps

$DESCRIPTION_OF_YOUR_USECASE_GOES_HERE

Moreover Documentation/filesystems/proc.txt should be updated as well.

Other than that, the patch looks good to me.

On Fri 03-02-17 15:33:22, Shaohua Li wrote:
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Minchan Kim <minchan@...nel.org>
> Cc: Hugh Dickins <hughd@...gle.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Rik van Riel <riel@...hat.com>
> Cc: Mel Gorman <mgorman@...hsingularity.net>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Shaohua Li <shli@...com>

after the description is added and documentation updated
Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  fs/proc/task_mmu.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index ee3efb2..8f2423f 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -440,6 +440,7 @@ struct mem_size_stats {
>  	unsigned long private_dirty;
>  	unsigned long referenced;
>  	unsigned long anonymous;
> +	unsigned long lazyfree;
>  	unsigned long anonymous_thp;
>  	unsigned long shmem_thp;
>  	unsigned long swap;
> @@ -456,8 +457,11 @@ static void smaps_account(struct mem_size_stats *mss, struct page *page,
>  	int i, nr = compound ? 1 << compound_order(page) : 1;
>  	unsigned long size = nr * PAGE_SIZE;
>  
> -	if (PageAnon(page))
> +	if (PageAnon(page)) {
>  		mss->anonymous += size;
> +		if (!PageSwapBacked(page))
> +			mss->lazyfree += size;
> +	}
>  
>  	mss->resident += size;
>  	/* Accumulate the size in pages that have been accessed. */
> @@ -770,6 +774,7 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
>  		   "Private_Dirty:  %8lu kB\n"
>  		   "Referenced:     %8lu kB\n"
>  		   "Anonymous:      %8lu kB\n"
> +		   "LazyFree:       %8lu kB\n"
>  		   "AnonHugePages:  %8lu kB\n"
>  		   "ShmemPmdMapped: %8lu kB\n"
>  		   "Shared_Hugetlb: %8lu kB\n"
> @@ -788,6 +793,7 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
>  		   mss.private_dirty >> 10,
>  		   mss.referenced >> 10,
>  		   mss.anonymous >> 10,
> +		   mss.lazyfree >> 10,
>  		   mss.anonymous_thp >> 10,
>  		   mss.shmem_thp >> 10,
>  		   mss.shared_hugetlb >> 10,
> -- 
> 2.9.3
> 

-- 
Michal Hocko
SUSE Labs