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

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Date:   Tue, 9 Apr 2019 16:28:18 +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 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?

> 
>> 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 */
>>
>