Balbir Singh wrote:
> Andrew Morton wrote:
>>> + nr_reclaimed += shrink_zones(priority, zones, sc);
>>> + if (sc->cnt == NULL)
>>> + shrink_slab(sc->nr_scanned, gfp_mask, lru_pages);
>> We don't we shrink slab if called to shrink a container.
>>
>> This is a fundamental design decision, and a design shortcoming. A full
>> discussion of this is absolutely appropriate to the patch changelog.
>> Please don't just hide stuff like this in the patch and leave people
>> wondering, or ignorant.
>
> Yes, we don't because we do not account for slab usage right now. We account
> only for memory allocated to user space. A good fat comment will help here.
>
>
I have already added the comment. But the problem is not in that we
do not account for kernel memory. Shrinking slabs won't unmap any
pages from user-space and thus won't help user to charge more. This
will only make kernel suffer from re-creation of objects.
Thanks,
Pavel.
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