Re: [PATCH v3 10/16] zsmalloc: factor page chain functionality out

[Minchan Kim]

On Mon, Apr 18, 2016 at 09:33:05AM +0900, Sergey Senozhatsky wrote:
> Hello,
> 
> On (03/30/16 16:12), Minchan Kim wrote:
> > @@ -1421,7 +1434,6 @@ static unsigned long obj_malloc(struct size_class *class,
> >  	unsigned long m_offset;
> >  	void *vaddr;
> >  
> > -	handle |= OBJ_ALLOCATED_TAG;
> 
> a nitpick, why did you replace this ALLOCATED_TAG assignment
> with 2 'handle | OBJ_ALLOCATED_TAG'?

I thought this handle variable in here is pure handle but OBJ_ALLOCATED_TAG
should live in head(i.e., link->handle), not pure handle, itself.

> 
> 	-ss
> 
> >  	obj = get_freeobj(first_page);
> >  	objidx_to_page_and_offset(class, first_page, obj,
> >  				&m_page, &m_offset);
> > @@ -1431,10 +1443,10 @@ static unsigned long obj_malloc(struct size_class *class,
> >  	set_freeobj(first_page, link->next >> OBJ_ALLOCATED_TAG);
> >  	if (!class->huge)
> >  		/* record handle in the header of allocated chunk */
> > -		link->handle = handle;
> > +		link->handle = handle | OBJ_ALLOCATED_TAG;
> >  	else
> >  		/* record handle in first_page->private */
> > -		set_page_private(first_page, handle);
> > +		set_page_private(first_page, handle | OBJ_ALLOCATED_TAG);
> >  	kunmap_atomic(vaddr);
> >  	mod_zspage_inuse(first_page, 1);
> >  	zs_stat_inc(class, OBJ_USED, 1);