diff options
| author | Daniel T. Lee <danieltimlee@gmail.com> | 2022-12-24 16:15:22 +0900 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2022-12-29 14:22:34 -0800 |
| commit | 1d0c5f6f3d1387ec9c3a379fb232c078f5838d55 (patch) | |
| tree | 3e4c4447088e9a1124e6e5ebe447479d1f094d2e /samples/bpf/map_perf_test_kern.c | |
| parent | 30465003ad776a922c32b2dac58db14f120f037e (diff) | |
| download | linux-1d0c5f6f3d1387ec9c3a379fb232c078f5838d55.tar.gz linux-1d0c5f6f3d1387ec9c3a379fb232c078f5838d55.tar.bz2 linux-1d0c5f6f3d1387ec9c3a379fb232c078f5838d55.zip | |
samples/bpf: Use kyscall instead of kprobe in syscall tracing program
Syscall tracing using kprobe is quite unstable. Since it uses the exact
name of the kernel function, the program might broke due to the rename
of a function. The problem can also be caused by a changes in the
arguments of the function to which the kprobe connects.
In this commit, ksyscall is used instead of kprobe. By using ksyscall,
libbpf will detect the appropriate kernel function name.
(e.g. sys_write -> __s390_sys_write). This eliminates the need to worry
about which wrapper function to attach in order to parse arguments.
In addition, ksyscall provides more fine method with attaching system
call, the coarse SYSCALL helper at trace_common.h can be removed.
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20221224071527.2292-2-danieltimlee@gmail.com
Diffstat (limited to 'samples/bpf/map_perf_test_kern.c')
| -rw-r--r-- | samples/bpf/map_perf_test_kern.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/samples/bpf/map_perf_test_kern.c b/samples/bpf/map_perf_test_kern.c index 7342c5b2f278..874e2f7e3d5d 100644 --- a/samples/bpf/map_perf_test_kern.c +++ b/samples/bpf/map_perf_test_kern.c @@ -11,7 +11,6 @@ #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> #include <bpf/bpf_core_read.h> -#include "trace_common.h" #define MAX_ENTRIES 1000 #define MAX_NR_CPUS 1024 @@ -102,7 +101,7 @@ struct { __uint(max_entries, MAX_ENTRIES); } lru_hash_lookup_map SEC(".maps"); -SEC("kprobe/" SYSCALL(sys_getuid)) +SEC("ksyscall/getuid") int stress_hmap(struct pt_regs *ctx) { u32 key = bpf_get_current_pid_tgid(); @@ -120,7 +119,7 @@ int stress_hmap(struct pt_regs *ctx) return 0; } -SEC("kprobe/" SYSCALL(sys_geteuid)) +SEC("ksyscall/geteuid") int stress_percpu_hmap(struct pt_regs *ctx) { u32 key = bpf_get_current_pid_tgid(); @@ -137,7 +136,7 @@ int stress_percpu_hmap(struct pt_regs *ctx) return 0; } -SEC("kprobe/" SYSCALL(sys_getgid)) +SEC("ksyscall/getgid") int stress_hmap_alloc(struct pt_regs *ctx) { u32 key = bpf_get_current_pid_tgid(); @@ -154,7 +153,7 @@ int stress_hmap_alloc(struct pt_regs *ctx) return 0; } -SEC("kprobe/" SYSCALL(sys_getegid)) +SEC("ksyscall/getegid") int stress_percpu_hmap_alloc(struct pt_regs *ctx) { u32 key = bpf_get_current_pid_tgid(); @@ -171,7 +170,7 @@ int stress_percpu_hmap_alloc(struct pt_regs *ctx) return 0; } -SEC("kprobe/" SYSCALL(sys_connect)) +SEC("ksyscall/connect") int stress_lru_hmap_alloc(struct pt_regs *ctx) { struct pt_regs *real_regs = (struct pt_regs *)PT_REGS_PARM1_CORE(ctx); @@ -251,7 +250,7 @@ done: return 0; } -SEC("kprobe/" SYSCALL(sys_gettid)) +SEC("ksyscall/gettid") int stress_lpm_trie_map_alloc(struct pt_regs *ctx) { union { @@ -273,7 +272,7 @@ int stress_lpm_trie_map_alloc(struct pt_regs *ctx) return 0; } -SEC("kprobe/" SYSCALL(sys_getpgid)) +SEC("ksyscall/getpgid") int stress_hash_map_lookup(struct pt_regs *ctx) { u32 key = 1, i; @@ -286,7 +285,7 @@ int stress_hash_map_lookup(struct pt_regs *ctx) return 0; } -SEC("kprobe/" SYSCALL(sys_getppid)) +SEC("ksyscall/getppid") int stress_array_map_lookup(struct pt_regs *ctx) { u32 key = 1, i; |