linux-kernel - Re: [PATCH v7 11/12] zsmalloc: page migration support

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Message-ID: <20160602001510.GA1736@bbox>
Date:	Thu, 2 Jun 2016 09:15:10 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH v7 11/12] zsmalloc: page migration support

On Wed, Jun 01, 2016 at 02:39:36PM -0700, Andrew Morton wrote:
> On Wed,  1 Jun 2016 08:21:20 +0900 Minchan Kim <minchan@...nel.org> wrote:
> 
> > This patch introduces run-time migration feature for zspage.
> > 
> > ...
> >
> > +static void kick_deferred_free(struct zs_pool *pool)
> > +{
> > +	schedule_work(&pool->free_work);
> > +}
> 
> When CONFIG_ZSMALLOC=m, what keeps all the data structures in place
> during a concurrent rmmod?
> 

The most of data structure in zram start to work by user calling
zs_create_pool and user of zsmalloc should call zs_destroy_pool
before trying doing rmmod where zs_unregister_migration does
flush_work(&pool->free_work).

If I miss something, please let me know it.