Re: [PATCH part2 v6 0/3] staging: zcache: Support zero-filled pages more efficiently

[Wanpeng Li <liwanp@linux.vnet.ibm.com>]

On Sun, Apr 07, 2013 at 10:51:27AM -0700, Dan Magenheimer wrote:
>> From: Wanpeng Li [mailto:liwanp@linux.vnet.ibm.com]
>> Subject: Re: [PATCH part2 v6 0/3] staging: zcache: Support zero-filled pages more efficiently
>> 
>> Hi Dan,
>> 
>> Some issues against Ramster:
>> 
>> - Ramster who takes advantage of zcache also should support zero-filled
>>   pages more efficiently, correct? It doesn't handle zero-filled pages well
>>   currently.
>
>When you first posted your patchset I took a quick look at ramster
>and it looked like your patchset should work for ramster also.
>However I didn't actually run ramster to try it so there may
>be a bug.  If it doesn't work, I would very much appreciate a patch.
>
>> - Ramster DebugFS counters are exported in /sys/kernel/mm/, but zcache/frontswap/cleancache
>>   all are exported in /sys/kernel/debug/, should we unify them?
>
>That would be great.
>
>> - If ramster also should move DebugFS counters to a single file like
>>   zcache do?
>
>Sure!  I am concerned about Konrad's patches adding debug.c as they
>add many global variables.  They are only required when ZCACHE_DEBUG
>is enabled so they may be ok.  If not, adding ramster variables
>to debug.c may make the problem worse.
>
>> If you confirm these issues are make sense to fix, I will start coding. ;-)

Hi Dan,

>
>That would be great.  Note that I have a how-to for ramster here:
>
>https://oss.oracle.com/projects/tmem/dist/files/RAMster/HOWTO-120817 
>
>If when you are testing you find that this how-to has mistakes,
>please let me know.  Or feel free to add the (corrected) how-to file
>as a patch in your patchset.

You can review my patchset [PATCH 00/10] staging: zcache/ramster: fix
and ramster/debugfs improvement

Just update TESTING RAMSTER part since some knobs are eported in 
/sys/kernel/debug/ramster/ instead of /sys/kernel/mm/ramster/ for 
your HOWTO file. 

D. TESTING RAMSTER 
+2) To see if RAMster is working, on the remote system

Regards,
Wanpeng Li 

>
>Thanks very much, Wanpeng, for your great contributions!
>
>(Ric, since you have expressed interest in ramster, if you try it and
>find corrections to the how-to file above, your input would be
>very much appreciated also!)
>
>Dan

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