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| author | Michal Hocko <mhocko@suse.com> | 2017-02-22 13:01:21 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-09 13:47:03 +0100 |
| commit | 915e70f9263d56fbf103742265025f7a492aa625 (patch) | |
| tree | 8e591ff930360492f2ff346d327cf0e1988168e0 /include/linux/sched.h | |
| parent | 12ab16597189993deb6a17827e137c0357ef0de6 (diff) | |
| download | op-kernel-dev-915e70f9263d56fbf103742265025f7a492aa625.zip op-kernel-dev-915e70f9263d56fbf103742265025f7a492aa625.tar.gz | |
staging, android: remove lowmemory killer from the tree
Lowmemory killer is sitting in the staging tree since 2008 without any
serious interest for fixing issues brought up by the MM folks. The main
objection is that the implementation is basically broken by design:
- it hooks into slab shrinker API which is not suitable for this
purpose. lowmem_count implementation just shows this nicely.
There is no scaling based on the memory pressure and no
feedback to the generic shrinker infrastructure.
Moreover lowmem_scan is called way too often for the heavy
work it performs.
- it is not reclaim context aware - no NUMA and/or memcg
awareness.
As the code stands right now it just adds a maintenance overhead when
core MM changes have to update lowmemorykiller.c as well. It also seems
that the alternative LMK implementation will be solely in the userspace
so this code has no perspective it seems. The staging tree is supposed
to be for a code which needs to be put in shape before it can be merged
which is not the case here obviously.
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index d67eee8..942c225 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1256,7 +1256,6 @@ extern struct pid *cad_pid; #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ -#define PFA_LMK_WAITING 3 /* Lowmemorykiller is waiting */ #define TASK_PFA_TEST(name, func) \ @@ -1282,9 +1281,6 @@ TASK_PFA_TEST(SPREAD_SLAB, spread_slab) TASK_PFA_SET(SPREAD_SLAB, spread_slab) TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) -TASK_PFA_TEST(LMK_WAITING, lmk_waiting) -TASK_PFA_SET(LMK_WAITING, lmk_waiting) - static inline void tsk_restore_flags(struct task_struct *task, unsigned long orig_flags, unsigned long flags) { |
