Re: [PATCH] add some drop_caches documentation and info messsge

[KOSAKI Motohiro]

On Wed, Oct 24, 2012 at 6:57 PM, Dave Hansen <dave@xxxxxxxxxxxxxxxxxx> wrote:
> On 10/24/2012 03:48 PM, Borislav Petkov wrote:
>> On Wed, Oct 24, 2012 at 02:18:38PM -0700, Dave Hansen wrote:
>>> Sounds fairly valid to me. But, it's also one that would not be harmed
>>> or disrupted in any way because of a single additional printk() during
>>> each suspend-to-disk operation.
>>
>> back to the drop_caches patch. How about we hide the drop_caches
>> interface behind some mm debugging option in "Kernel Hacking"? Assuming
>> we don't need it otherwise on production kernels. Probably make it
>> depend on CONFIG_DEBUG_VM like CONFIG_DEBUG_VM_RB or so.
>>
>> And then also add it to /proc/vmstat, in addition.
>
> That effectively means removing it from the kernel since distros ship
> with those config options off.  We don't want to do that since there
> _are_ valid, occasional uses like benchmarking that we want to be
> consistent.

Agreed. we don't want to remove valid interface never.
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