linux-kernel - Re: [PATCH] mm/vmstat: fix /proc/vmstat format for CONFIG_DEBUG_TLBFLUSH=y CONFIG

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Message-ID: <abd24dbf-c5b2-1222-c066-5a6736ad3ecb@yandex-team.ru>
Date:   Tue, 9 Apr 2019 18:14:50 +0300
From:   Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:     Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Roman Gushchin <guro@...com>, Jann Horn <jannh@...gle.com>
Subject: Re: [PATCH] mm/vmstat: fix /proc/vmstat format for
 CONFIG_DEBUG_TLBFLUSH=y CONFIG_SMP=n



On 09.04.2019 17:43, Vlastimil Babka wrote:
> On 4/9/19 3:28 PM, Konstantin Khlebnikov wrote:
>> On 09.04.2019 16:16, Vlastimil Babka wrote:
>>> On 4/9/19 3:01 PM, Konstantin Khlebnikov wrote:
>>>> Commit 58bc4c34d249 ("mm/vmstat.c: skip NR_TLB_REMOTE_FLUSH* properly")
>>>> depends on skipping vmstat entries with empty name introduced in commit
>>>> 7aaf77272358 ("mm: don't show nr_indirectly_reclaimable in /proc/vmstat")
>>>> but reverted in commit b29940c1abd7 ("mm: rename and change semantics of
>>>> nr_indirectly_reclaimable_bytes").
>>>
>>> Oops, good catch.
>>
>> Also 4.19.y has broken format in /sys/devices/system/node/node*/vmstat and /proc/zoneinfo.
>> Do you have any plans on pushing related slab changes into that stable branch?
> 
> Hmm do you mean this?
> https://lore.kernel.org/linux-mm/20181030174649.16778-1-guro@fb.com/
> 
> Looks like Roman marked it wrongly for # 4.14.x-4.18.x and I didn't notice, my
> slab changes are indeed 4.20, so we should resend for 4.19.

Yep, this should fix zoneinfo
but /sys/devices/system/node/node*/vmstat needs yet another fix.

> 
>>>
>>>> So, skipping no longer works and /proc/vmstat has misformatted lines " 0".
>>>> This patch simply shows debug counters "nr_tlb_remote_*" for UP.
>>>
>>> Right, that's the the best solution IMHO.
>>>
>>>> Fixes: 58bc4c34d249 ("mm/vmstat.c: skip NR_TLB_REMOTE_FLUSH* properly")
>>>> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
>>>
>>> Acked-by: Vlastimil Babka <vbabka@...e.cz>
>>>
>>>> ---
>>>>    mm/vmstat.c |    5 -----
>>>>    1 file changed, 5 deletions(-)
>>>>
>>>> diff --git a/mm/vmstat.c b/mm/vmstat.c
>>>> index 36b56f858f0f..a7d493366a65 100644
>>>> --- a/mm/vmstat.c
>>>> +++ b/mm/vmstat.c
>>>> @@ -1274,13 +1274,8 @@ const char * const vmstat_text[] = {
>>>>    #endif
>>>>    #endif /* CONFIG_MEMORY_BALLOON */
>>>>    #ifdef CONFIG_DEBUG_TLBFLUSH
>>>> -#ifdef CONFIG_SMP
>>>>    	"nr_tlb_remote_flush",
>>>>    	"nr_tlb_remote_flush_received",
>>>> -#else
>>>> -	"", /* nr_tlb_remote_flush */
>>>> -	"", /* nr_tlb_remote_flush_received */
>>>> -#endif /* CONFIG_SMP */
>>>>    	"nr_tlb_local_flush_all",
>>>>    	"nr_tlb_local_flush_one",
>>>>    #endif /* CONFIG_DEBUG_TLBFLUSH */
>>>>
>>>
>>
>