On Tue, Feb 23, 2010 at 10:40:40AM +0100, Andrea Righi wrote:
> > If vm_highmem_is_dirtyable=0, In that case, we can still return with
> > "memcg_memory" which can be more than "memory". IOW, highmem is not
> > dirtyable system wide but still we can potetially return back saying
> > for this cgroup we can dirty more pages which can potenailly be acutally
> > be more that system wide allowed?
> >
> > Because you have modified dirtyable_memory() and made it per cgroup, I
> > think it automatically takes care of the cases of per cgroup dirty ratio,
> > I mentioned in my previous mail. So we will use system wide dirty ratio
> > to calculate the allowed dirty pages in this cgroup (dirty_ratio *
> > available_memory()) and if this cgroup wrote too many pages start
> > writeout?
>
> OK, if I've understood well, you're proposing to use per-cgroup
> dirty_ratio interface and do something like:
>
> unsigned long determine_dirtyable_memory(void)
> {
> unsigned long memcg_memory, memory;
>
> memory = global_page_state(NR_FREE_PAGES) + global_reclaimable_pages();
> if (!vm_highmem_is_dirtyable)
> memory -= highmem_dirtyable_memory(memory);
>
> memcg_memory = mem_cgroup_page_state(MEMCG_NR_FREE_PAGES);
> if (!memcg_memory)
> return memory + 1; /* Ensure that we never return 0 */
> memcg_memory += mem_cgroup_page_state(MEMCG_NR_RECLAIMABLE_PAGES);
> if (!vm_highmem_is_dirtyable)
> memcg_memory -= highmem_dirtyable_memory(memory) *
> mem_cgroup_dirty_ratio() / 100;
ok, this is wrong:
> if (memcg_memory < memory)
> return memcg_memory;
> }
return min(memcg_memory, memory);
-Andrea
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