linux-kernel - Re: [RFC 01/15] slub: Create sysfs field /sys/slab/<cache>/ops

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Date:   Tue, 12 Mar 2019 12:16:54 +1100
From:   "Tobin C. Harding" <me@...in.cc>
To:     Roman Gushchin <guro@...com>
Cc:     "Tobin C. Harding" <tobin@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christopher Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...helsinki.fi>,
        Matthew Wilcox <willy@...radead.org>,
        Tycho Andersen <tycho@...ho.ws>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 01/15] slub: Create sysfs field /sys/slab/<cache>/ops

On Mon, Mar 11, 2019 at 09:23:27PM +0000, Roman Gushchin wrote:
> On Fri, Mar 08, 2019 at 03:14:12PM +1100, Tobin C. Harding wrote:
> > Create an ops field in /sys/slab/*/ops to contain all the callback
> > operations defined for a slab cache. This will be used to display
> > the additional callbacks that will be defined soon to enable movable
> > objects.
> > 
> > Display the existing ctor callback in the ops fields contents.
> > 
> > Co-developed-by: Christoph Lameter <cl@...ux.com>
> > Signed-off-by: Tobin C. Harding <tobin@...nel.org>
> 
> Hi Tobin!
> 
> > ---
> >  mm/slub.c | 13 +++++++++----
> >  1 file changed, 9 insertions(+), 4 deletions(-)
> > 
> > diff --git a/mm/slub.c b/mm/slub.c
> > index dc777761b6b7..69164aa7cbbf 100644
> > --- a/mm/slub.c
> > +++ b/mm/slub.c
> > @@ -5009,13 +5009,18 @@ static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf,
> >  }
> >  SLAB_ATTR(cpu_partial);
> >  
> > -static ssize_t ctor_show(struct kmem_cache *s, char *buf)
> > +static ssize_t ops_show(struct kmem_cache *s, char *buf)
> >  {
> > +	int x = 0;
> > +
> >  	if (!s->ctor)
> >  		return 0;
>         ^^^^^^^^^^^^^^^^^
> You can drop this part, can't you?
> 
> Also, it's not clear (without looking into following patches) why do you
> make this refactoring. So, please, add a note, or move this change into
> the patch 3.

No worries, thanks for looking at this.  Will amend the commit message
and drop the constructor check.

thanks,
Tobin