Re: [PATCH V8 3/4] mm: frontswap: add swap hooks and extendtry_to_unuse

[KAMEZAWA Hiroyuki]

On Thu, 8 Sep 2011 08:50:11 -0700 (PDT)
Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> wrote:

> > From: Andrew Morton [mailto:akpm@xxxxxxxxxxxxxxxxxxxx]
> > Sent: Wednesday, September 07, 2011 5:27 PM
> > To: Dan Magenheimer
> > Subject: Re: [PATCH V8 3/4] mm: frontswap: add swap hooks and extend try_to_unuse
> > 
> > On Mon, 29 Aug 2011 09:49:29 -0700
> > Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> wrote:
> > 
> > > -static int try_to_unuse(unsigned int type)
> > > +int try_to_unuse(unsigned int type, bool frontswap,
> > 
> > Are patches 2 and 3 in the wrong order?
> 
> No, they've applied in that order and built after each patch
> properly for well over a year.  At a minimum, frontswap.h must
> be created before patch 3of4, though I suppose the introduction
> of frontswap.c could be after patch 3of4... Note that frontswap.c
> (which calls try_to_unuse()) is non-functional (and isn't even built)
> until after patch 4of4 is applied.
> 
> There is enough interdependency between the four parts
> that perhaps it should all be a single commit.  I split
> it up for reviewer's convenience but apparently different
> reviewers use different review processes than I anticipated. :-}
> 

IIRC, I said 'please move this change of line to patch 1'.

Thanks,
-Kame

This was my 1st reply.

> > From: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
> > Subject: [PATCH V7 1/4] mm: frontswap: swap data structure changes
> > 
> > This first patch of four in the frontswap series makes available core
> > swap data structures (swap_lock, swap_list and swap_info) that are
> > needed by frontswap.c but we don't need to expose them to the dozens
> > of files that include swap.h so we create a new swapfile.h just to
> > extern-ify these.
> > 
> > Also add frontswap-related elements to swap_info_struct.  Frontswap_map
> > points to vzalloc'ed one-bit-per-swap-page metadata that indicates
> > whether the swap page is in frontswap or in the device and frontswap_pages
> > counts how many pages are in frontswap.
> > 
> > [v7: rebase to 3.0-rc3]
> > [v7: JBeulich@xxxxxxxxxx: add new swap struct elements only if config'd]
> > [v6: rebase to 3.0-rc1]
> > [v5: no change from v4]
> > [v4: rebase to 2.6.39]
> > Signed-off-by: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
> > Reviewed-by: Konrad Wilk <konrad.wilk@xxxxxxxxxx>
> > Acked-by: Jan Beulich <JBeulich@xxxxxxxxxx>
> > Acked-by: Seth Jennings <sjenning@xxxxxxxxxxxxxxxxxx>
> > Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
> > Cc: Hugh Dickins <hughd@xxxxxxxxxx>
> > Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> > Cc: Nitin Gupta <ngupta@xxxxxxxxxx>
> > Cc: Matthew Wilcox <matthew@xxxxxx>
> > Cc: Chris Mason <chris.mason@xxxxxxxxxx>
> > Cc: Rik Riel <riel@xxxxxxxxxx>
> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> 
> Hmm....could you modify mm/swapfile.c and remove 'static' in the same patch ?
> 

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