Re: [LSF/MM ATTEND] slab cache extension -- slab cache in fixed size

[Jeff Liu <jeff.liu@oracle.com>]

Hi Christoph,

I'm so sorry for the too late response as I took a longer vacations.

On 01/31 2014 23:44 PM, Christoph Lameter wrote:
> On Wed, 15 Jan 2014, Jeff Liu wrote:
> 
>> Now I have a rough/stupid idea to add an extension to the slab caches [2], that is
>> if the slab cache size is limited which could be determined in cache_grow(), the
>> shrinker would be triggered accordingly.  I'd like to learn/know if there are any
>> suggestions and similar requirements in other subsystems.
> 
> Hmmm.... Looks like you got the right point where to insert the code to
> check for the limit. But lets leave the cache creation API the way it is.
> Add a function to set the limit?

Good idea. Yeah, changing the existing API is suboptimal than adding a new one.

In this case, another thing I'm hesitating about whether to export the cache_limit
via /proc/slabinfo by extending its tunable fields -- the per-CPU slab cache limit
and batchcount, as thus will change the user space interface and slabtop(1) need to
be modified accordingly.


Thank!

-Jeff

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