Something went wrong. Try again.
(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869// SPDX-License-Identifier: GPL-2.0#include <vmlinux.h>#include <bpf/bpf_helpers.h>
#define TEST_STACK_DEPTH 2#define TEST_MAX_ENTRIES 16384
typedef __u64 stack_trace_t[TEST_STACK_DEPTH];
struct { __uint(type, BPF_MAP_TYPE_STACK_TRACE); __uint(max_entries, TEST_MAX_ENTRIES); __type(key, __u32); __type(value, stack_trace_t);} stackmap SEC(".maps");
struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, TEST_MAX_ENTRIES); __type(key, __u32); __type(value, __u32);} stackid_hmap SEC(".maps");
struct { __uint(type, BPF_MAP_TYPE_ARRAY); __uint(max_entries, TEST_MAX_ENTRIES); __type(key, __u32); __type(value, stack_trace_t);} stack_amap SEC(".maps");
int pid = 0;int control = 0;int failed = 0;
SEC("tracepoint/sched/sched_switch")int oncpu(struct trace_event_raw_sched_switch *ctx){ __u32 max_len = TEST_STACK_DEPTH * sizeof(__u64); __u32 key = 0, val = 0; __u64 *stack_p;
if (pid != (bpf_get_current_pid_tgid() >> 32)) return 0;
if (control) return 0;
/* it should allow skipping whole buffer size entries */ key = bpf_get_stackid(ctx, &stackmap, TEST_STACK_DEPTH); if ((int)key >= 0) { /* The size of stackmap and stack_amap should be the same */ bpf_map_update_elem(&stackid_hmap, &key, &val, 0); stack_p = bpf_map_lookup_elem(&stack_amap, &key); if (stack_p) { bpf_get_stack(ctx, stack_p, max_len, TEST_STACK_DEPTH); /* it wrongly skipped all the entries and filled zero */ if (stack_p[0] == 0) failed = 1; } } else { /* old kernel doesn't support skipping that many entries */ failed = 2; }
return 0;}
char _license[] SEC("license") = "GPL";