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Date: Fri, 24 Oct 2014 19:10:16 +0900
From: Gioh Kim <gioh.kim@....com>
To: PINTU KUMAR <pintu.k@...sung.com>, akpm@...ux-foundation.org,
riel@...hat.com, aquini@...hat.com, paul.gortmaker@...driver.com,
jmarchan@...hat.com, lcapitulino@...hat.com,
kirill.shutemov@...ux.intel.com, m.szyprowski@...sung.com,
aneesh.kumar@...ux.vnet.ibm.com, iamjoonsoo.kim@....com,
mina86@...a86.com, lauraa@...eaurora.org, mgorman@...e.de,
rientjes@...gle.com, hannes@...xchg.org, vbabka@...e.cz,
sasha.levin@...cle.com, linux-kernel@...r.kernel.org,
linux-mm@...ck.org
CC: pintu_agarwal@...oo.com, cpgs@...sung.com, vishnu.ps@...sung.com,
rohit.kr@...sung.com, ed.savinay@...sung.com
Subject: Re: [PATCH v2 2/2] fs: proc: Include cma info in proc/meminfo
2014-10-24 오후 5:57, PINTU KUMAR 쓴 글:
> Hi,
>
> ----- Original Message -----
>> From: Gioh Kim <gioh.kim@....com>
>> To: Pintu Kumar <pintu.k@...sung.com>; akpm@...ux-foundation.org;
> riel@...hat.com; aquini@...hat.com; paul.gortmaker@...driver.com;
> jmarchan@...hat.com; lcapitulino@...hat.com;
> kirill.shutemov@...ux.intel.com; m.szyprowski@...sung.com;
> aneesh.kumar@...ux.vnet.ibm.com; iamjoonsoo.kim@....com; mina86@...a86.com;
> lauraa@...eaurora.org; mgorman@...e.de; rientjes@...gle.com; hannes@...xchg.
> org; vbabka@...e.cz; sasha.levin@...cle.com; linux-kernel@...r.kernel.org;
> linux-mm@...ck.org
>> Cc: pintu_agarwal@...oo.com; cpgs@...sung.com; vishnu.ps@...sung.com;
> rohit.kr@...sung.com; ed.savinay@...sung.com
>> Sent: Thursday, 23 October 2014 5:49 AM
>> Subject: Re: [PATCH v2 2/2] fs: proc: Include cma info in proc/meminfo
>>
>>
>>
>> 2014-10-22 오후 11:06, Pintu Kumar 쓴 글:
>>> This patch include CMA info (CMATotal, CMAFree) in /proc/meminfo.
>>> Currently, in a CMA enabled system, if somebody wants to know the
>>> total CMA size declared, there is no way to tell, other than the dmesg
>>> or /var/log/messages logs.
>>> With this patch we are showing the CMA info as part of meminfo, so that
>>> it can be determined at any point of time.
>>> This will be populated only when CMA is enabled.
>>>
>>> Below is the sample output from a ARM based device with RAM:512MB and
>> CMA:16MB.
>>>
>>> MemTotal: 471172 kB
>>> MemFree: 111712 kB
>>> MemAvailable: 271172 kB
>>> .
>>> .
>>> .
>>> CmaTotal: 16384 kB
>>> CmaFree: 6144 kB
>>>
>>> This patch also fix below checkpatch errors that were found during these
>> changes.
>>
>> Why don't you split patch for it?
>> I think there's a rule not to mix separate patchs.
>>
>
> Last time when we submitted separate patches for checkpatch errors, it was
> suggested to
> Include these kinds of fixes along with some meaningful patches together.
> So, we included it in same patch.
>
>>>
>>> ERROR: space required after that ',' (ctx:ExV)
>>> 199: FILE: fs/proc/meminfo.c:199:
>>> + ,atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT -
>> 10)
>>> ^
>>>
>>> ERROR: space required after that ',' (ctx:ExV)
>>> 202: FILE: fs/proc/meminfo.c:202:
>>> + ,K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
>>> ^
>>>
>>> ERROR: space required after that ',' (ctx:ExV)
>>> 206: FILE: fs/proc/meminfo.c:206:
>>> + ,K(totalcma_pages)
>>> ^
>>>
>>> total: 3 errors, 0 warnings, 2 checks, 236 lines checked
>>>
>>> Signed-off-by: Pintu Kumar <pintu.k@...sung.com>
>>> Signed-off-by: Vishnu Pratap Singh <vishnu.ps@...sung.com>
>>> ---
>>> fs/proc/meminfo.c | 15 +++++++++++++--
>>> 1 file changed, 13 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
>>> index aa1eee0..d3ebf2e 100644
>>> --- a/fs/proc/meminfo.c
>>> +++ b/fs/proc/meminfo.c
>>> @@ -12,6 +12,9 @@
>>> #include <linux/vmstat.h>
>>> #include <linux/atomic.h>
>>> #include <linux/vmalloc.h>
>>> +#ifdef CONFIG_CMA
>>> +#include <linux/cma.h>
>>> +#endif
>>> #include <asm/page.h>
>>> #include <asm/pgtable.h>
>>> #include "internal.h"
>>> @@ -138,6 +141,10 @@ static int meminfo_proc_show(struct seq_file *m,
> void
>> *v)
>>> #ifdef CONFIG_TRANSPARENT_HUGEPAGE
>>> "AnonHugePages: %8lu kB\n"
>>> #endif
>>> +#ifdef CONFIG_CMA
>>> + "CmaTotal: %8lu kB\n"
>>> + "CmaFree: %8lu kB\n"
>>> +#endif
>>> ,
>>> K(i.totalram),
>>> K(i.freeram),
>>> @@ -187,12 +194,16 @@ static int meminfo_proc_show(struct seq_file *m,
> void
>> *v)
>>> vmi.used >> 10,
>>> vmi.largest_chunk >> 10
>>> #ifdef CONFIG_MEMORY_FAILURE
>>> - ,atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT -
>> 10)
>>> + , atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT -
>> 10)
>>> #endif
>>> #ifdef CONFIG_TRANSPARENT_HUGEPAGE
>>> - ,K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
>>> + , K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
>>> HPAGE_PMD_NR)
>>> #endif
>>> +#ifdef CONFIG_CMA
>>> + , K(totalcma_pages)
>>> + , K(global_page_state(NR_FREE_CMA_PAGES))
>>> +#endif
>>> );
>>
>> Just for sure, are zoneinfo and pagetypeinfo not suitable?
>>
>
> I think zoneinfo shows only current free cma pages.
> Same is the case with vmstat.
> # cat /proc/zoneinfo | grep cma
> nr_free_cma 2560
> # cat /proc/vmstat | grep cma
> nr_free_cma 2560
We could add a line to show total cma pages like following and add it all.
# cat /proc/zoneinfo | grep cma
nr_total_cma XXXX
nr_free_cma 2560
Yes. each zone can have cma area and it is annoying to add it all.
But IMO it is rare and not difficult.
And I think it'd better that zoneinfo has nr_total_cma line.
I think you already considered my thoughts and choosed /proc/meminfo for a certain reason.
Why is /proc/meminfo better?
Andrew already accepted it. I'm not against your idea. Just curious.
>
>> I don't know HOTPLUG feature so I'm just asking for sure.
>> Does HOTPLUG not need printing message like this?
>>
>
> Sorry, I am also not sure what hotplug feature you are referring to.
I mean "memory hotplug" feature.
Forget it ;-)
>
>> Thanks a lot.
>>
>>
>>>
>>> hugetlb_report_meminfo(m);
>>>
>>
>> --
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>
>
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