linux-kernel - Re: [PATCH v2 4/4] mm: Generalize putback scan functions

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Date:   Mon, 18 Feb 2019 11:20:13 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     Daniel Jordan <daniel.m.jordan@...cle.com>
Cc:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mhocko@...e.com" <mhocko@...e.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/4] mm: Generalize putback scan functions



On 16.02.2019 01:13, Daniel Jordan wrote:
> On Fri, Feb 15, 2019 at 10:01:05PM +0000, Kirill Tkhai wrote:
>> On 15.02.2019 23:39, Daniel Jordan wrote:
>>> On Thu, Feb 14, 2019 at 01:35:37PM +0300, Kirill Tkhai wrote:
>>>> +static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
>>>> +						     struct list_head *list)
>>>>  {
>>>>  	struct pglist_data *pgdat = lruvec_pgdat(lruvec);
>>>> +	int nr_pages, nr_moved = 0;
>>>>  	LIST_HEAD(pages_to_free);
>>>> +	struct page *page;
>>>> +	enum lru_list lru;
>>>>  
>>>> -	/*
>>>> -	 * Put back any unfreeable pages.
>>>> -	 */
>>>> -	while (!list_empty(page_list)) {
>>>> -		struct page *page = lru_to_page(page_list);
>>>> -		int lru;
>>>> -
>>>> +	while (!list_empty(list)) {
>>>> +		page = lru_to_page(list);
>>>>  		VM_BUG_ON_PAGE(PageLRU(page), page);
>>>> -		list_del(&page->lru);
>>>>  		if (unlikely(!page_evictable(page))) {
>>>> +			list_del_init(&page->lru);
>>>
>>> Why change to list_del_init?  It's more special than list_del but doesn't seem
>>> needed since the page is list_add()ed later.
>>
>> Not something special is here, I'll remove this _init.
>>  
>>> That postprocess script from patch 1 seems kinda broken before this series, and
>>> still is.  Not that it should block this change.  Out of curiosity did you get
>>> it to run?
>>
>> I fixed all new warnings, which come with my changes, so the patch does not make
>> the script worse.
>>
>> If you change all already existing warnings by renaming variables in appropriate
>> places, the script will work in some way. But I'm not sure this is enough to get
>> results correct, and I have no a big wish to dive into perl to fix warnings
>> introduced by another people, so I don't plan to do with this script something else.
> 
> Ok, was asking in case I was doing something wrong.
> 
> With the above change, for the series, you can add
> 
> Reviewed-by: Daniel Jordan <daniel.m.jordan@...cle.com>

Ok, thanks.