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authorEric Dumazet <edumazet@google.com>2017-12-12 14:22:39 -0800
committerAlexei Starovoitov <ast@kernel.org>2017-12-12 15:27:22 -0800
commit9147efcbe0b7cc96b18eb64b1a3f0d4bba81443c (patch)
treee96ef5a6e898fd45ca4d48f467f71fa505ff807e /kernel
parent9dbd2d948e7345595e5b90e44795c1e8ca3e5728 (diff)
bpf: add schedule points to map alloc/free
While using large percpu maps, htab_map_alloc() can hold cpu for hundreds of ms. This patch adds cond_resched() calls to percpu alloc/free call sites, all running in process context. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/bpf/hashtab.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c
index e469e05c8e83..3905d4bc5b80 100644
--- a/kernel/bpf/hashtab.c
+++ b/kernel/bpf/hashtab.c
@@ -114,6 +114,7 @@ static void htab_free_elems(struct bpf_htab *htab)
pptr = htab_elem_get_ptr(get_htab_elem(htab, i),
htab->map.key_size);
free_percpu(pptr);
+ cond_resched();
}
free_elems:
bpf_map_area_free(htab->elems);
@@ -159,6 +160,7 @@ static int prealloc_init(struct bpf_htab *htab)
goto free_elems;
htab_elem_set_ptr(get_htab_elem(htab, i), htab->map.key_size,
pptr);
+ cond_resched();
}
skip_percpu_elems: