* [PATCH] bpf: follow idr code convention
@ 2018-03-27 18:53 Shaohua Li
2018-03-27 20:58 ` Daniel Borkmann
0 siblings, 1 reply; 2+ messages in thread
From: Shaohua Li @ 2018-03-27 18:53 UTC (permalink / raw)
To: netdev @ vger . kernel . org
Cc: Kernel Team, Shaohua Li, Daniel Borkmann, Alexei Starovoitov
From: Shaohua Li <shli@fb.com>
Generally we do a preload before doing idr allocation. This also help
improve the allocation success rate in memory pressure.
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Shaohua Li <shli@fb.com>
---
kernel/bpf/syscall.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 43f95d1..beab5de 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -203,11 +203,13 @@ static int bpf_map_alloc_id(struct bpf_map *map)
{
int id;
+ idr_preload(GFP_KERNEL);
spin_lock_bh(&map_idr_lock);
id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC);
if (id > 0)
map->id = id;
spin_unlock_bh(&map_idr_lock);
+ idr_preload_end();
if (WARN_ON_ONCE(!id))
return -ENOSPC;
@@ -940,11 +942,13 @@ static int bpf_prog_alloc_id(struct bpf_prog *prog)
{
int id;
+ idr_preload(GFP_KERNEL);
spin_lock_bh(&prog_idr_lock);
id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC);
if (id > 0)
prog->aux->id = id;
spin_unlock_bh(&prog_idr_lock);
+ idr_preload_end();
/* id is in [1, INT_MAX) */
if (WARN_ON_ONCE(!id))
--
2.9.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] bpf: follow idr code convention
2018-03-27 18:53 [PATCH] bpf: follow idr code convention Shaohua Li
@ 2018-03-27 20:58 ` Daniel Borkmann
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Borkmann @ 2018-03-27 20:58 UTC (permalink / raw)
To: Shaohua Li, netdev @ vger . kernel . org
Cc: Kernel Team, Shaohua Li, Alexei Starovoitov
On 03/27/2018 08:53 PM, Shaohua Li wrote:
> From: Shaohua Li <shli@fb.com>
>
> Generally we do a preload before doing idr allocation. This also help
> improve the allocation success rate in memory pressure.
>
> Cc: Daniel Borkmann <daniel@iogearbox.net>
> Cc: Alexei Starovoitov <ast@kernel.org>
> Signed-off-by: Shaohua Li <shli@fb.com>
Looks good, applied to bpf-next, thanks Shaohua!
^ permalink raw reply [flat|nested] 2+ messages in thread
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2018-03-27 20:58 ` Daniel Borkmann
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