From: Minchan Kim <minchan@kernel.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
gregkh@linuxfoundation.org, surenb@google.com,
joaodias@google.com, jhubbard@nvidia.com, digetx@gmail.com
Subject: Re: [PATCH v5] mm: cma: support sysfs
Date: Tue, 23 Mar 2021 20:31:31 -0700 [thread overview]
Message-ID: <YFqyk0/yXs2kMP76@google.com> (raw)
In-Reply-To: <20210324030224.GO1719932@casper.infradead.org>
On Wed, Mar 24, 2021 at 03:02:24AM +0000, Matthew Wilcox wrote:
> On Tue, Mar 23, 2021 at 12:50:50PM -0700, Minchan Kim wrote:
> > + /* the number of CMA page successful allocations */
> > + atomic64_t nr_pages_succeeded;
>
> > +void cma_sysfs_alloc_pages_count(struct cma *cma, size_t count)
> > +{
> > + atomic64_add(count, &cma->nr_pages_succeeded);
> > +}
>
> I don't understand. A size_t is a byte count. But the variable is called
> 'nr_pages'. So which is it, a byte count or a page count?
It's page count. I followed the cma_alloc interface since it has
size_t count variable for nr_pages.
Let's go with unsigned long nr_pages:
void cma_sysfs_alloc_pages_count(struct cma *cma, unsigned long
nr_pages)
>
> > +static ssize_t alloc_pages_success_show(struct kobject *kobj,
> > + struct kobj_attribute *attr, char *buf)
> > +{
> > + struct cma_kobject *cma_kobj = container_of(kobj,
> > + struct cma_kobject, kobj);
> > + struct cma *cma = cma_kobj->cma;
> > +
> > + return sysfs_emit(buf, "%llu\n",
> > + atomic64_read(&cma->nr_pages_succeeded));
>
> ... if it's in bytes, it should probably be reported in kilobytes
> and be suffixed with a 'K' like many other stats.
>
next prev parent reply other threads:[~2021-03-24 3:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-23 19:50 [PATCH v5] mm: cma: support sysfs Minchan Kim
2021-03-23 21:19 ` Dmitry Osipenko
2021-03-23 21:29 ` Dmitry Osipenko
2021-03-23 21:44 ` Dmitry Osipenko
2021-03-24 0:54 ` Minchan Kim
2021-03-24 3:02 ` Matthew Wilcox
2021-03-24 3:31 ` Minchan Kim [this message]
2021-03-24 4:34 ` Matthew Wilcox
2021-03-24 5:45 ` Minchan Kim
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