xavi/android_kernel_m2note/mm/slab_common.c, branch lp-5.1

slab: do not panic if we fail to create memcg cache

2016-09-28T13:14:28+00:00

There is no point in flooding logs with warnings or especially crashing the system if we fail to create a cache for a memcg. In this case we will be accounting the memcg allocation to the root cgroup until we succeed to create its own cache, but it isn't that critical. Signed-off-by: Vladimir Davydov Cc: Michal Hocko Cc: Glauber Costa Cc: Johannes Weiner Cc: Pekka Enberg Cc: Christoph Lameter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: W4TCH0UT

slab: clean up kmem_cache_create_memcg() error handling

2016-09-28T13:14:27+00:00

Currently kmem_cache_create_memcg() backoffs on failure inside conditionals, without using gotos. This results in the rollback code duplication, which makes the function look cumbersome even though on error we should only free the allocated cache. Since in the next patch I am going to add yet another rollback function call on error path there, let's employ labels instead of conditionals for undoing any changes on failure to keep things clean. Signed-off-by: Vladimir Davydov Reviewed-by: Pekka Enberg Cc: Michal Hocko Cc: Glauber Costa Cc: Johannes Weiner Cc: Christoph Lameter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: W4TCH0UT Conflicts: mm/slab_common.c Signed-off-by: W4TCH0UT

mm/slab: Give s_next and s_stop slab-specific names

2016-09-28T13:14:26+00:00

Give s_next and s_stop slab-specific names instead of exporting "s_next" and "s_stop". Signed-off-by: Wanpeng Li Signed-off-by: Pekka Enberg Signed-off-by: W4TCH0UT

mm/slab: Fix /proc/slabinfo unwriteable for slab

2016-09-28T13:14:25+00:00

Slab have some tunables like limit, batchcount, and sharedfactor can be tuned through function slabinfo_write. Commit (b7454ad3: mm/sl[au]b: Move slabinfo processing to slab_common.c) uncorrectly change /proc/slabinfo unwriteable for slab, this patch fix it by revert to original mode. Acked-by: Christoph Lameter Signed-off-by: Wanpeng Li Signed-off-by: Pekka Enberg Signed-off-by: W4TCH0UT

mm/slab: Sharing s_next and s_stop between slab and slub

2016-09-28T13:14:24+00:00

This patch shares s_next and s_stop between slab and slub. Acked-by: Christoph Lameter Signed-off-by: Wanpeng Li Signed-off-by: Pekka Enberg Signed-off-by: W4TCH0UT

mm, slab_common: add 'unlikely' to size check of kmalloc_slab()

2016-09-28T13:14:14+00:00

Size is usually below than KMALLOC_MAX_SIZE. If we add a 'unlikely' macro, compiler can make better code. Acked-by: Christoph Lameter Signed-off-by: Joonsoo Kim Signed-off-by: Pekka Enberg Signed-off-by: W4TCH0UT

memcg, slab: never try to merge memcg caches

2016-09-28T13:14:03+00:00

When a kmem cache is created (kmem_cache_create_memcg()), we first try to find a compatible cache that already exists and can handle requests from the new cache, i.e. has the same object size, alignment, ctor, etc. If there is such a cache, we do not create any new caches, instead we simply increment the refcount of the cache found and return it. Currently we do this procedure not only when creating root caches, but also for memcg caches. However, there is no point in that, because, as every memcg cache has exactly the same parameters as its parent and cache merging cannot be turned off in runtime (only on boot by passing "slub_nomerge"), the root caches of any two potentially mergeable memcg caches should be merged already, i.e. it must be the same root cache, and therefore we couldn't even get to the memcg cache creation, because it already exists. The only exception is boot caches - they are explicitly forbidden to be merged by setting their refcount to -1. There are currently only two of them - kmem_cache and kmem_cache_node, which are used in slab internals (I do not count kmalloc caches as their refcount is set to 1 immediately after creation). Since they are prevented from merging preliminary I guess we should avoid to merge their children too. So let's remove the useless code responsible for merging memcg caches. Signed-off-by: Vladimir Davydov Cc: Michal Hocko Cc: Johannes Weiner Cc: David Rientjes Cc: Pekka Enberg Cc: Glauber Costa Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: W4TCH0UT Conflicts: mm/slab_common.c Signed-off-by: W4TCH0UT

memcg, kmem: rename cache_from_memcg to cache_from_memcg_idx

2016-09-28T13:12:54+00:00

We can't see the relationship with memcg from the parameters, so the name with memcg_idx would be more reasonable. Signed-off-by: Qiang Huang Reviewed-by: Pekka Enberg Acked-by: David Rientjes Cc: Johannes Weiner Cc: Michal Hocko Cc: Glauber Costa Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: W4TCH0UT

first commit

2016-08-15T02:19:42+00:00