linux-kernel - Re: [PATCH v6 6/7] zsmalloc: account the number of compacted pages

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Date:	Tue, 7 Jul 2015 23:21:09 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH v6 6/7] zsmalloc: account the number of compacted pages

On (07/07/15 22:39), Minchan Kim wrote:
[..]
> >  struct zs_pool_stats {
> > -	/* How many objects were migrated */
> > -	u64		num_migrated;
> > +	/* How many pages were migrated (freed) */
> > +	u64		pages_compacted;
> 
> Hmm, if we account it as page unit, unsigned long is enough for 32bit.

Well, this is a 'how many pages were freed overall' counter. We don't
control the lifetime of device, so I think it can be bigger than 4 bytes
in some `extreme' cases.

	-ss
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