linux-kernel - Re: [PATCH] mm: khugepaged: add trace status description for SCAN_PAGE_HAS

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Date:   Tue, 26 Nov 2019 09:38:06 -0800
From:   Yang Shi <yang.shi@...ux.alibaba.com>
To:     Anshuman Khandual <anshuman.khandual@....com>,
        songliubraving@...com, kirill.shutemov@...ux.intel.com,
        akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: khugepaged: add trace status description for
 SCAN_PAGE_HAS_PRIVATE



On 11/26/19 12:57 AM, Anshuman Khandual wrote:
>
> On 11/25/2019 11:57 PM, Yang Shi wrote:
>> The commit 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0 ("mm,thp: add
> Reduce the commit SHA ID here to just 12 digits instead ?

Yes, sure.

>
>> read-only THP support for (non-shmem) FS") instroduced a new khugepaged
> s/instroduced/introduced/

Will fix.

>
>> scan result: SCAN_PAGE_HAS_PRIVATE, but the corresponding description
>> for trance events were not added.
> s/trance/trace/

My fat finger :-(

>
>> Cc: Song Liu <songliubraving@...com>
>> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
>> Signed-off-by: Yang Shi <yang.shi@...ux.alibaba.com>
>> ---
>>   include/trace/events/huge_memory.h | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/trace/events/huge_memory.h b/include/trace/events/huge_memory.h
>> index dd4db33..d49fbce 100644
>> --- a/include/trace/events/huge_memory.h
>> +++ b/include/trace/events/huge_memory.h
>> @@ -31,7 +31,8 @@
>>   	EM( SCAN_ALLOC_HUGE_PAGE_FAIL,	"alloc_huge_page_failed")	\
>>   	EM( SCAN_CGROUP_CHARGE_FAIL,	"ccgroup_charge_failed")	\
>>   	EM( SCAN_EXCEED_SWAP_PTE,	"exceed_swap_pte")		\
>> -	EMe(SCAN_TRUNCATED,		"truncated")			\
>> +	EM( SCAN_TRUNCATED,		"truncated")			\
>> +	EMe(SCAN_PAGE_HAS_PRIVATE,	"has_private")			\
> Majority of the SCAN_PAGE_* scan results have page_ in the front. Hence we
> should just follow same pattern here and make it 'page_has_private' instead.

Some do start with "page_", anyway either is fine to me.

>
>>   
>>   #undef EM
>>   #undef EMe
>>