diff options
| -rw-r--r-- | include/uapi/linux/bpf.h | 54 |
1 files changed, 27 insertions, 27 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 530ff6588d8f..8daef7326bb7 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -1770,33 +1770,33 @@ union bpf_attr { * * int bpf_get_stack(struct pt_regs *regs, void *buf, u32 size, u64 flags) * Description - * Return a user or a kernel stack in bpf program provided buffer. - * To achieve this, the helper needs *ctx*, which is a pointer - * to the context on which the tracing program is executed. - * To store the stacktrace, the bpf program provides *buf* with - * a nonnegative *size*. - * - * The last argument, *flags*, holds the number of stack frames to - * skip (from 0 to 255), masked with - * **BPF_F_SKIP_FIELD_MASK**. The next bits can be used to set - * the following flags: - * - * **BPF_F_USER_STACK** - * Collect a user space stack instead of a kernel stack. - * **BPF_F_USER_BUILD_ID** - * Collect buildid+offset instead of ips for user stack, - * only valid if **BPF_F_USER_STACK** is also specified. - * - * **bpf_get_stack**\ () can collect up to - * **PERF_MAX_STACK_DEPTH** both kernel and user frames, subject - * to sufficient large buffer size. Note that - * this limit can be controlled with the **sysctl** program, and - * that it should be manually increased in order to profile long - * user stacks (such as stacks for Java programs). To do so, use: - * - * :: - * - * # sysctl kernel.perf_event_max_stack=<new value> + * Return a user or a kernel stack in bpf program provided buffer. + * To achieve this, the helper needs *ctx*, which is a pointer + * to the context on which the tracing program is executed. + * To store the stacktrace, the bpf program provides *buf* with + * a nonnegative *size*. + * + * The last argument, *flags*, holds the number of stack frames to + * skip (from 0 to 255), masked with + * **BPF_F_SKIP_FIELD_MASK**. The next bits can be used to set + * the following flags: + * + * **BPF_F_USER_STACK** + * Collect a user space stack instead of a kernel stack. + * **BPF_F_USER_BUILD_ID** + * Collect buildid+offset instead of ips for user stack, + * only valid if **BPF_F_USER_STACK** is also specified. + * + * **bpf_get_stack**\ () can collect up to + * **PERF_MAX_STACK_DEPTH** both kernel and user frames, subject + * to sufficient large buffer size. Note that + * this limit can be controlled with the **sysctl** program, and + * that it should be manually increased in order to profile long + * user stacks (such as stacks for Java programs). To do so, use: + * + * :: + * + * # sysctl kernel.perf_event_max_stack=<new value> * * Return * a non-negative value equal to or less than size on success, or |