For reducing size of page_cgroup, we need to reduce flags.
This patch is a trial to remove flags based on
linux-next +
memcg-add-mem_cgroup_replace_page_cache-to-fix-lru-issue.patch +
4 patches for 'simplify LRU handling' I posted.
So, I don't ask anyone to test this but want to hear another idea
or comments on implemenation.
After this patch series, page_cgroup flags are
enum {
/* flags for mem_cgroup */
PCG_LOCK, /* Lock for pc->mem_cgroup and following bits. */
PCG_USED, /* this object is in use. */
PCG_MIGRATION, /* under page migration */
__NR_PCG_FLAGS,
};
3bits. I thought I could remove PCG_MIGRATION ....but failed.
BTW, because of kmalloc()'s alignment, low 3bits of pc->mem_cgroup must be 0.
So, we can move these flags to low bits in pc->mem_cgroup...I guess.
(But in another thoughts, we need to track blkio per page finally. So, I'm
not sure whether we can remove page_cgroup at the end.)
Anyway, I dump a current trial series. Please comment when you have time.
I'm not in hurry and will not be able to make a quick response.
Thanks,
-Kame
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