linux-kernel - Re: [PATCH v1 1/2] zsmalloc: add allocated objects counter for subpage

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Date:   Wed, 21 Jun 2023 13:59:43 +0000
From:   Alexey Romanov <AVRomanov@...rdevices.ru>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>
CC:     Minchan Kim <minchan@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kernel <kernel@...rdevices.ru>
Subject: Re: [PATCH v1 1/2] zsmalloc: add allocated objects counter for
 subpage

On Wed, Jun 21, 2023 at 10:55:18PM +0900, Sergey Senozhatsky wrote:
> On (23/06/21 13:41), Alexey Romanov wrote:
> [..]
> > > +static bool zspage_empty(struct zspage *zspage)
> > > +{
> > > +	return get_zspage_inuse(zspage) == 0;
> > > +}
> > > +
> > >  /**
> > >   * zs_lookup_class_index() - Returns index of the zsmalloc &size_class
> > >   * that hold objects of the provided size.
> > > @@ -1787,6 +1792,10 @@ static void migrate_zspage(struct zs_pool *pool, struct size_class *class,
> > >  		obj_idx++;
> > >  		record_obj(handle, free_obj);
> > >  		obj_free(class->size, used_obj, NULL);
> > > +
> > > +		/* Stop if there are no more objects to migrate */
> > > +		if (zspage_empty(get_zspage(s_page)))
> > > +			break;
> > >  	}
> > 
> > Yes it seems my version is not as good as I thought. Looks bad for an
> > architecturally dependent PAGE_SIZE. [..]
> 
> Well, we are looking for a solution that is both reasonable (perf wise)
> and is maintainable.
> 
> > I can implement this option. I'll test this and send patch this week.
> 
> Either that or, if Suggested-by: Alexey Romanov <AVRomanov@...rdevices.ru>
> is good enough for you, then I can send a series tonight or tomorrow (after
> some testing). I have two more patches on top of that one.

Yeah, Suggested-by is OK. Let's send a patch. Thank you.

-- 
Thank you,
Alexey