diff mbox series

[bpf-next] bpf: Check map->record at the begin of check_and_free_fields()

Message ID 20250315150239.1505137-1-houtao@huaweicloud.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series [bpf-next] bpf: Check map->record at the begin of check_and_free_fields() | expand

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Commit Message

Hou Tao March 15, 2025, 3:02 p.m. UTC 
From: Hou Tao <houtao1@huawei.com>

When there is no special field in the map value, there is no need to
invoke bpf_obj_free_fields(). Therefore, checking the validity of
map->record in advance.

After the change, the benchmark result of per-cpu update case in
map_perf_test increase 30%+.

Signed-off-by: Hou Tao <houtao1@huawei.com>
---
 kernel/bpf/hashtab.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Hou Tao March 15, 2025, 2:54 p.m. UTC | #1 
Please ignore this patch. Send out the old version that has not been
proofread yet. Will resend. Sorry for the inconvenience.

On 3/15/2025 11:02 PM, Hou Tao wrote:
> From: Hou Tao <houtao1@huawei.com>
>
> When there is no special field in the map value, there is no need to
> invoke bpf_obj_free_fields(). Therefore, checking the validity of
> map->record in advance.
>
> After the change, the benchmark result of per-cpu update case in
> map_perf_test increase 30%+.
>
> Signed-off-by: Hou Tao <houtao1@huawei.com>
> ---
>  kernel/bpf/hashtab.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c
> index 6527e9ce83cd9..2623970175dcf 100644
> --- a/kernel/bpf/hashtab.c
> +++ b/kernel/bpf/hashtab.c
> @@ -906,6 +906,9 @@ static void htab_free_dynptr_key(struct bpf_htab *htab, void *key)
>  static void check_and_free_fields(struct bpf_htab *htab,
>  				  struct htab_elem *elem)
>  {
> +	if (IS_ERR_OR_NULL(htab->map.record))
> +		return;
> +
>  	if (htab_is_percpu(htab)) {
>  		void __percpu *pptr = htab_elem_get_ptr(elem, htab->map.key_size);
>  		int cpu;
diff mbox series

Patch

diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c
index 6527e9ce83cd9..2623970175dcf 100644
--- a/kernel/bpf/hashtab.c
+++ b/kernel/bpf/hashtab.c
@@ -906,6 +906,9 @@  static void htab_free_dynptr_key(struct bpf_htab *htab, void *key)
 static void check_and_free_fields(struct bpf_htab *htab,
 				  struct htab_elem *elem)
 {
+	if (IS_ERR_OR_NULL(htab->map.record))
+		return;
+
 	if (htab_is_percpu(htab)) {
 		void __percpu *pptr = htab_elem_get_ptr(elem, htab->map.key_size);
 		int cpu;