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Subject[RFC][PATCH 0/5] memcg : some patches related to swap.
This patch is memcg update set. (the last post was 23/Oct)

This patch is agaisnt 2.6.28-rc2-mm1. (mmotm at 30/Oct)

Major changes from previous one.
- dropped lazy_lru related patches. It's complicated and I'd like to
design it again. (Nishimura-san reported a bug to me.)
Fortunately, no big Hunk.

- added a patch for swap_cache. (cut out from mem+swap controller.)
IMHO, this is necessary to do. But previous trial (in summer) caused tons of
troubles. I think currrent memcg's code is better than old ones and I hope
this trial will be much easier.

and fixed typos and logics.

brief patch description is here. I'd like to send [1/5] in the next week.
Review and test is welcome. [2-5/5] of patches should be tested more.
And I'd like to clean up them before sending...

[1/5] change force_empty to do move account.
- current force_empty just drops page_cgroup reference. But this means
leak of accounting. After this patch, remaining pages at rmdir() will be
moved to parent group.

[2/5] account swap cache
- when processes exceed limit of memory, swap-cache can be created.
Now, swap-cache is not accounted and can be spread over hundreds of mega
bytes. I don't think this is sane. This patch makes swap_cache to be accounted.

[3/5] mem+swap controller config.
- add Kconfig for mem+swap controller.

[4/5] swap_cgroup
- create a buffer to remember account information of swap.
Because my x86-32 test environment is poor, x86-32 test report is welcome.
This patch uses HIGHMEM to rememver information.

[5/5]
- mem+swap controller.
After this patch, a page swapped-in will be accounted against an original group
which allocated memory swapped-out.
This is not swap controller but mem+swap controller. This limits sum of
pages + swaps_on_disk. By this,
- global LRU's swap-out will not hit the limit. (page is converted to swap.)
- a group of processes leaking memory will be effectively blocked.

TODO list:
- more optimization
- add "shrink_usage" file
- remove mem_cgroup_per_zone->lock and use zone->lru_lock ?
- consider behavior of oom-kill again.
- need some notifier to tell memory shortage as mem_notity ?
- dirty page accountng and throttle.
- we have to decied how to handle HUGE_PAGE
- kernel support for hierarchy ?
- help bio_cgroup people.

Oh, too long ;)

Thanks,
-Kame











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