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bpf: add schedule points to map alloc/free

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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>
This commit is contained in:
Eric Dumazet 2017-12-12 14:22:39 -08:00 committed by Alexei Starovoitov
parent 9dbd2d948e
commit 9147efcbe0
1 changed files with 2 additions and 0 deletions
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2
kernel/bpf/hashtab.c
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@ -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: