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authorRoman Gushchin <guro@fb.com>2019-05-29 18:03:58 -0700
committerAlexei Starovoitov <ast@kernel.org>2019-05-31 16:52:56 -0700
commitb936ca643ade11f265fa10e5fb71c20d9c5243f1 (patch)
treefab6cc685363f4f9901fecf6335a8d8e6974f8b3 /kernel/bpf/arraymap.c
parent3539b96e041c06e4317082816d90ec09160aeb11 (diff)
bpf: rework memlock-based memory accounting for maps
In order to unify the existing memlock charging code with the memcg-based memory accounting, which will be added later, let's rework the current scheme. Currently the following design is used: 1) .alloc() callback optionally checks if the allocation will likely succeed using bpf_map_precharge_memlock() 2) .alloc() performs actual allocations 3) .alloc() callback calculates map cost and sets map.memory.pages 4) map_create() calls bpf_map_init_memlock() which sets map.memory.user and performs actual charging; in case of failure the map is destroyed <map is in use> 1) bpf_map_free_deferred() calls bpf_map_release_memlock(), which performs uncharge and releases the user 2) .map_free() callback releases the memory The scheme can be simplified and made more robust: 1) .alloc() calculates map cost and calls bpf_map_charge_init() 2) bpf_map_charge_init() sets map.memory.user and performs actual charge 3) .alloc() performs actual allocations <map is in use> 1) .map_free() callback releases the memory 2) bpf_map_charge_finish() performs uncharge and releases the user The new scheme also allows to reuse bpf_map_charge_init()/finish() functions for memcg-based accounting. Because charges are performed before actual allocations and uncharges after freeing the memory, no bogus memory pressure can be created. In cases when the map structure is not available (e.g. it's not created yet, or is already destroyed), on-stack bpf_map_memory structure is used. The charge can be transferred with the bpf_map_charge_move() function. Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf/arraymap.c')
-rw-r--r--kernel/bpf/arraymap.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index 8fda24e78193..3552da4407d9 100644
--- a/kernel/bpf/arraymap.c
+++ b/kernel/bpf/arraymap.c
@@ -83,6 +83,7 @@ static struct bpf_map *array_map_alloc(union bpf_attr *attr)
u32 elem_size, index_mask, max_entries;
bool unpriv = !capable(CAP_SYS_ADMIN);
u64 cost, array_size, mask64;
+ struct bpf_map_memory mem;
struct bpf_array *array;
elem_size = round_up(attr->value_size, 8);
@@ -125,23 +126,26 @@ static struct bpf_map *array_map_alloc(union bpf_attr *attr)
}
cost = round_up(cost, PAGE_SIZE) >> PAGE_SHIFT;
- ret = bpf_map_precharge_memlock(cost);
+ ret = bpf_map_charge_init(&mem, cost);
if (ret < 0)
return ERR_PTR(ret);
/* allocate all map elements and zero-initialize them */
array = bpf_map_area_alloc(array_size, numa_node);
- if (!array)
+ if (!array) {
+ bpf_map_charge_finish(&mem);
return ERR_PTR(-ENOMEM);
+ }
array->index_mask = index_mask;
array->map.unpriv_array = unpriv;
/* copy mandatory map attributes */
bpf_map_init_from_attr(&array->map, attr);
- array->map.memory.pages = cost;
+ bpf_map_charge_move(&array->map.memory, &mem);
array->elem_size = elem_size;
if (percpu && bpf_array_alloc_percpu(array)) {
+ bpf_map_charge_finish(&array->map.memory);
bpf_map_area_free(array);
return ERR_PTR(-ENOMEM);
}