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Message-ID: <CAHbLzkpkzgq+YK9s1fLW9L90oBo87eaZPp3GEPv=Ug1uV9mmcA@mail.gmail.com>
Date: Thu, 16 Jun 2022 08:48:40 -0700
From: Yang Shi <shy828301@...il.com>
To: Miaohe Lin <linmiaohe@...wei.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Andrea Arcangeli <aarcange@...hat.com>,
Matthew Wilcox <willy@...radead.org>,
Vlastimil Babka <vbabka@...e.cz>,
David Howells <dhowells@...hat.com>, NeilBrown <neilb@...e.de>,
Alistair Popple <apopple@...dia.com>,
David Hildenbrand <david@...hat.com>,
Suren Baghdasaryan <surenb@...gle.com>,
Peter Xu <peterx@...hat.com>, Linux MM <linux-mm@...ck.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/7] mm/khugepaged: use helper macro __ATTR_RW
On Thu, Jun 16, 2022 at 12:07 AM Miaohe Lin <linmiaohe@...wei.com> wrote:
>
> On 2022/6/16 5:28, Yang Shi wrote:
> > On Sat, Jun 11, 2022 at 1:47 AM Miaohe Lin <linmiaohe@...wei.com> wrote:
> >>
> >> Use helper macro __ATTR_RW to define the khugepaged attributes. Minor
> >> readability improvement.
> >>
> >> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> >> ---
> >> mm/khugepaged.c | 37 +++++++++++++++----------------------
> >> 1 file changed, 15 insertions(+), 22 deletions(-)
> >>
> >> diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> >> index 8e6fad7c7bd9..142e26e4bdbf 100644
> >> --- a/mm/khugepaged.c
> >> +++ b/mm/khugepaged.c
> >> @@ -147,8 +147,7 @@ static ssize_t scan_sleep_millisecs_store(struct kobject *kobj,
> >> return count;
> >> }
> >> static struct kobj_attribute scan_sleep_millisecs_attr =
> >> - __ATTR(scan_sleep_millisecs, 0644, scan_sleep_millisecs_show,
> >> - scan_sleep_millisecs_store);
> >> + __ATTR_RW(scan_sleep_millisecs);
> >>
> >> static ssize_t alloc_sleep_millisecs_show(struct kobject *kobj,
> >> struct kobj_attribute *attr,
> >> @@ -175,8 +174,7 @@ static ssize_t alloc_sleep_millisecs_store(struct kobject *kobj,
> >> return count;
> >> }
> >> static struct kobj_attribute alloc_sleep_millisecs_attr =
> >> - __ATTR(alloc_sleep_millisecs, 0644, alloc_sleep_millisecs_show,
> >> - alloc_sleep_millisecs_store);
> >> + __ATTR_RW(alloc_sleep_millisecs);
> >>
> >> static ssize_t pages_to_scan_show(struct kobject *kobj,
> >> struct kobj_attribute *attr,
> >> @@ -200,8 +198,7 @@ static ssize_t pages_to_scan_store(struct kobject *kobj,
> >> return count;
> >> }
> >> static struct kobj_attribute pages_to_scan_attr =
> >> - __ATTR(pages_to_scan, 0644, pages_to_scan_show,
> >> - pages_to_scan_store);
> >> + __ATTR_RW(pages_to_scan);
> >>
> >> static ssize_t pages_collapsed_show(struct kobject *kobj,
> >> struct kobj_attribute *attr,
> >> @@ -221,13 +218,13 @@ static ssize_t full_scans_show(struct kobject *kobj,
> >> static struct kobj_attribute full_scans_attr =
> >> __ATTR_RO(full_scans);
> >>
> >> -static ssize_t khugepaged_defrag_show(struct kobject *kobj,
> >> +static ssize_t defrag_show(struct kobject *kobj,
> >> struct kobj_attribute *attr, char *buf)
> >
> > Why do you rename all the functions? Seems unnecessary and less intriguing TBH.
>
> It's because e.g. __ATTR_RW(defrag) expects the defrag_show and defrag_store instead
> of khugepaged_defrag_show and khugepaged_defrag_store.
Aha, I see. I missed this.
Reviewed-by: Yang Shi <shy828301@...il.com>
>
> Thanks.
>
> >
> >> {
> >> return single_hugepage_flag_show(kobj, attr, buf,
> >> TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG);
> >> }
> >> -static ssize_t khugepaged_defrag_store(struct kobject *kobj,
> >> +static ssize_t defrag_store(struct kobject *kobj,
> >> struct kobj_attribute *attr,
> >> const char *buf, size_t count)
> >> {
> >> @@ -235,8 +232,7 @@ static ssize_t khugepaged_defrag_store(struct kobject *kobj,
> >> TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG);
> >> }
> >> static struct kobj_attribute khugepaged_defrag_attr =
> >> - __ATTR(defrag, 0644, khugepaged_defrag_show,
> >> - khugepaged_defrag_store);
> >> + __ATTR_RW(defrag);
> >>
> >> /*
> >> * max_ptes_none controls if khugepaged should collapse hugepages over
> >> @@ -246,13 +242,13 @@ static struct kobj_attribute khugepaged_defrag_attr =
> >> * runs. Increasing max_ptes_none will instead potentially reduce the
> >> * free memory in the system during the khugepaged scan.
> >> */
> >> -static ssize_t khugepaged_max_ptes_none_show(struct kobject *kobj,
> >> +static ssize_t max_ptes_none_show(struct kobject *kobj,
> >> struct kobj_attribute *attr,
> >> char *buf)
> >> {
> >> return sysfs_emit(buf, "%u\n", khugepaged_max_ptes_none);
> >> }
> >> -static ssize_t khugepaged_max_ptes_none_store(struct kobject *kobj,
> >> +static ssize_t max_ptes_none_store(struct kobject *kobj,
> >> struct kobj_attribute *attr,
> >> const char *buf, size_t count)
> >> {
> >> @@ -268,17 +264,16 @@ static ssize_t khugepaged_max_ptes_none_store(struct kobject *kobj,
> >> return count;
> >> }
> >> static struct kobj_attribute khugepaged_max_ptes_none_attr =
> >> - __ATTR(max_ptes_none, 0644, khugepaged_max_ptes_none_show,
> >> - khugepaged_max_ptes_none_store);
> >> + __ATTR_RW(max_ptes_none);
> >>
> >> -static ssize_t khugepaged_max_ptes_swap_show(struct kobject *kobj,
> >> +static ssize_t max_ptes_swap_show(struct kobject *kobj,
> >> struct kobj_attribute *attr,
> >> char *buf)
> >> {
> >> return sysfs_emit(buf, "%u\n", khugepaged_max_ptes_swap);
> >> }
> >>
> >> -static ssize_t khugepaged_max_ptes_swap_store(struct kobject *kobj,
> >> +static ssize_t max_ptes_swap_store(struct kobject *kobj,
> >> struct kobj_attribute *attr,
> >> const char *buf, size_t count)
> >> {
> >> @@ -295,17 +290,16 @@ static ssize_t khugepaged_max_ptes_swap_store(struct kobject *kobj,
> >> }
> >>
> >> static struct kobj_attribute khugepaged_max_ptes_swap_attr =
> >> - __ATTR(max_ptes_swap, 0644, khugepaged_max_ptes_swap_show,
> >> - khugepaged_max_ptes_swap_store);
> >> + __ATTR_RW(max_ptes_swap);
> >>
> >> -static ssize_t khugepaged_max_ptes_shared_show(struct kobject *kobj,
> >> +static ssize_t max_ptes_shared_show(struct kobject *kobj,
> >> struct kobj_attribute *attr,
> >> char *buf)
> >> {
> >> return sysfs_emit(buf, "%u\n", khugepaged_max_ptes_shared);
> >> }
> >>
> >> -static ssize_t khugepaged_max_ptes_shared_store(struct kobject *kobj,
> >> +static ssize_t max_ptes_shared_store(struct kobject *kobj,
> >> struct kobj_attribute *attr,
> >> const char *buf, size_t count)
> >> {
> >> @@ -322,8 +316,7 @@ static ssize_t khugepaged_max_ptes_shared_store(struct kobject *kobj,
> >> }
> >>
> >> static struct kobj_attribute khugepaged_max_ptes_shared_attr =
> >> - __ATTR(max_ptes_shared, 0644, khugepaged_max_ptes_shared_show,
> >> - khugepaged_max_ptes_shared_store);
> >> + __ATTR_RW(max_ptes_shared);
> >>
> >> static struct attribute *khugepaged_attr[] = {
> >> &khugepaged_defrag_attr.attr,
> >> --
> >> 2.23.0
> >>
> >>
> > .
> >
>
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