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Message-ID: <c48b8562-4375-ab22-9dfa-224f3e27a079@huawei.com>
Date: Thu, 16 Jun 2022 15:07:47 +0800
From: Miaohe Lin <linmiaohe@...wei.com>
To: Yang Shi <shy828301@...il.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 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.
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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