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fix hardirqs

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This commit is contained in:
yunwei37
2023-01-23 18:58:00 +08:00
parent a95a767bc9
commit e8c84d0c35
4 changed files with 63 additions and 5 deletions
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31
10-hardirqs/bits.bpf.h Normal file
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@@ -0,0 +1,31 @@
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
#ifndef __BITS_BPF_H
#define __BITS_BPF_H
#define READ_ONCE(x) (*(volatile typeof(x) *)&(x))
#define WRITE_ONCE(x, val) ((*(volatile typeof(x) *)&(x)) = val)
static __always_inline u64 log2(u32 v)
{
u32 shift, r;
r = (v > 0xFFFF) << 4; v >>= r;
shift = (v > 0xFF) << 3; v >>= shift; r |= shift;
shift = (v > 0xF) << 2; v >>= shift; r |= shift;
shift = (v > 0x3) << 1; v >>= shift; r |= shift;
r |= (v >> 1);
return r;
}
static __always_inline u64 log2l(u64 v)
{
u32 hi = v >> 32;
if (hi)
return log2(hi) + 32;
else
return log2(v);
}
#endif /* __BITS_BPF_H */

7
10-hardirqs/hardirqs.bpf.c
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@@ -15,6 +15,10 @@ const volatile bool targ_dist = false;
const volatile bool targ_ns = false;
const volatile bool do_count = false;
struct irq_key {
char name[32];
};
struct {
__uint(type, BPF_MAP_TYPE_CGROUP_ARRAY);
__type(key, u32);
@@ -29,6 +33,7 @@ struct {
__type(value, u64);
} start SEC(".maps");
/// @sample {"interval": 1000, "type" : "log2_hist"}
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, MAX_ENTRIES);
@@ -127,4 +132,4 @@ int BPF_PROG(irq_handler_exit, int irq, struct irqaction *action)
return handle_exit(irq, action);
}
char LICENSE[] SEC("license") = "GPL";
char LICENSE[] SEC("license") = "GPL";

4
10-hardirqs/hardirq.h → 10-hardirqs/hardirqs.h
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@@ -4,10 +4,6 @@
#define MAX_SLOTS 20
struct irq_key {
char name[32];
};
struct info {
__u64 count;
__u32 slots[MAX_SLOTS];

26
10-hardirqs/maps.bpf.h Normal file
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@@ -0,0 +1,26 @@
// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
// Copyright (c) 2020 Anton Protopopov
#ifndef __MAPS_BPF_H
#define __MAPS_BPF_H
#include <bpf/bpf_helpers.h>
#include <asm-generic/errno.h>
static __always_inline void *
bpf_map_lookup_or_try_init(void *map, const void *key, const void *init)
{
void *val;
long err;
val = bpf_map_lookup_elem(map, key);
if (val)
return val;
err = bpf_map_update_elem(map, key, init, BPF_NOEXIST);
if (err && err != -EEXIST)
return 0;
return bpf_map_lookup_elem(map, key);
}
#endif /* __MAPS_BPF_H */