From: PINTU KUMAR <pintu.k@samsung.com>
To: "'Vlastimil Babka'" <vbabka@suse.cz>, akpm@linux-foundation.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        iamjoonsoo.kim@lge.com, mhocko@suse.cz, riel@redhat.com,
        emunson@akamai.com, mgorman@suse.de, zhangyanfei@cn.fujitsu.com,
        rientjes@google.com
Cc: cpgs@samsung.com, pintu_agarwal@yahoo.com, pintu.k@outlook.com,
        vishnu.ps@samsung.com, rohit.kr@samsung.com
References: <1438956233-28690-1-git-send-email-pintu.k@samsung.com>
 <55C4BE1A.8050408@suse.cz>
In-reply-to: <55C4BE1A.8050408@suse.cz>
Subject: RE: [PATCH 1/1] mm: compaction: include compact_nodes in compaction.h
Date: Tue, 11 Aug 2015 16:15:54 +0530
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Hi,

> -----Original Message-----
> From: Vlastimil Babka [mailto:vbabka@suse.cz]
> Sent: Friday, August 07, 2015 7:48 PM
> To: Pintu Kumar; akpm@linux-foundation.org; linux-kernel@vger.kernel.org;
> linux-mm@kvack.org; iamjoonsoo.kim@lge.com; mhocko@suse.cz;
> riel@redhat.com; emunson@akamai.com; mgorman@suse.de;
> zhangyanfei@cn.fujitsu.com; rientjes@google.com
> Cc: cpgs@samsung.com; pintu_agarwal@yahoo.com; pintu.k@outlook.com;
> vishnu.ps@samsung.com; rohit.kr@samsung.com
> Subject: Re: [PATCH 1/1] mm: compaction: include compact_nodes in
> compaction.h
> 
> On 08/07/2015 04:03 PM, Pintu Kumar wrote:
> > This patch declares compact_nodes prototype in compaction.h header
> > file.
> > This will allow us to call compaction from other places.
> > For example, during system suspend, suppose we want to check the
> > fragmentation state of the system. Then based on certain threshold, we
> > can invoke compaction, when system is idle.
> > There could be other use cases.
> 
> Isn't it more common to introduce such visibility changes only as part of series
> that actually benefit from it?
> 
Other series are not ready right now and not defined yet. It may take longer time.
I thought, it is left to the user, if somebody wants to invoke compaction from other sub-system.

> Otherwise next month somebody might notice that it's unused outside
> compaction.c and send a cleanup patch to make it static again...
> 
> > Signed-off-by: Pintu Kumar <pintu.k@samsung.com>
> > ---
> >   include/linux/compaction.h |    2 +-
> >   mm/compaction.c            |    2 +-
> >   2 files changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/include/linux/compaction.h b/include/linux/compaction.h
> > index aa8f61c..800ff50 100644
> > --- a/include/linux/compaction.h
> > +++ b/include/linux/compaction.h
> > @@ -50,7 +50,7 @@ extern bool compaction_deferred(struct zone *zone, int
> order);
> >   extern void compaction_defer_reset(struct zone *zone, int order,
> >   				bool alloc_success);
> >   extern bool compaction_restarting(struct zone *zone, int order);
> > -
> > +extern void compact_nodes(void);
> >   #else
> >   static inline unsigned long try_to_compact_pages(gfp_t gfp_mask,
> >   			unsigned int order, int alloc_flags, diff --git
> a/mm/compaction.c
> > b/mm/compaction.c index 16e1b57..b793922 100644
> > --- a/mm/compaction.c
> > +++ b/mm/compaction.c
> > @@ -1657,7 +1657,7 @@ static void compact_node(int nid)
> >   }
> >
> >   /* Compact all nodes in the system */ -static void
> > compact_nodes(void)
> > +void compact_nodes(void)
> >   {
> >   	int nid;
> >
> >

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