linux-kernel - Re: [PATCH v8 3/5] mm,page_owner: Display all stacks and their count

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Date: Tue, 13 Feb 2024 10:19:45 +0100
From: Oscar Salvador <osalvador@...e.de>
To: Marco Elver <elver@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Michal Hocko <mhocko@...e.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Alexander Potapenko <glider@...gle.com>
Subject: Re: [PATCH v8 3/5] mm,page_owner: Display all stacks and their count

On Tue, Feb 13, 2024 at 09:38:43AM +0100, Marco Elver wrote:
> On Mon, 12 Feb 2024 at 23:29, Oscar Salvador <osalvador@...e.de> wrote:
> > Signed-off-by: Oscar Salvador <osalvador@...e.de>
> 
> Acked-by: Marco Elver <elver@...gle.com>

Thanks!

 
> > +                       /* This pairs with smp_load_acquire() from function
> 
> Comment should be
> 
> /*
>  *
> ...
>  */

Yap, fat fingers here.

> > +       if (!*ppos) {
> > +               /*
> > +                * This pairs with smp_store_release() from function
> > +                * add_stack_record_to_list(), so we get a consistent
> > +                * value of stack_list.
> > +                */
> > +               stack = smp_load_acquire(&stack_list);
> 
> I'm not sure if it'd make your code simpler or not: there is
> <linux/llist.h> for singly-linked linked lists, although the code to
> manage the list is simple enough I'm indifferent here. Only consider
> it if it helps you make the code simpler.

I will check if it eases the code somehow.


> > +static void stack_stop(struct seq_file *m, void *v)
> > +{
> > +}
> 
> Is this function even needed if it's empty? I recall there were some
> boilerplate "nop" functions that could be used.

I will check if seq already provides a dummy function for these cases.

-- 
Oscar Salvador
SUSE Labs