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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2021-09-24 04:03:49 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2021-10-06 00:30:08 +0300
commit6954e415264eeb5ee6be0d22d789ad12c995ee64 (patch)
tree12da7d7dafca9da48f6b42d917a24ff84244f0f1 /kernel/trace/trace.h
parentbf094cffea2a6503ce84062f9f0243bef77c58f9 (diff)
downloadlinux-6954e415264eeb5ee6be0d22d789ad12c995ee64.tar.xz
tracing: Place trace_pid_list logic into abstract functions
Instead of having the logic that does trace_pid_list open coded, wrap it in abstract functions. This will allow a rewrite of the logic that implements the trace_pid_list without affecting the users. Note, this causes a change in behavior. Every time a pid is written into the set_*_pid file, it creates a new list and uses RCU to update it. If pid_max is lowered, but there was a pid currently in the list that was higher than pid_max, those pids will now be removed on updating the list. The old behavior kept that from happening. The rewrite of the pid_list logic will no longer depend on pid_max, and will return the old behavior. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.h')
-rw-r--r--kernel/trace/trace.h14
1 files changed, 10 insertions, 4 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index b7c0f8e160fb..2ec500186992 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -22,6 +22,8 @@
#include <linux/ctype.h>
#include <linux/once_lite.h>
+#include "pid_list.h"
+
#ifdef CONFIG_FTRACE_SYSCALLS
#include <asm/unistd.h> /* For NR_SYSCALLS */
#include <asm/syscall.h> /* some archs define it here */
@@ -188,10 +190,14 @@ struct trace_options {
struct trace_option_dentry *topts;
};
-struct trace_pid_list {
- int pid_max;
- unsigned long *pids;
-};
+struct trace_pid_list *trace_pid_list_alloc(void);
+void trace_pid_list_free(struct trace_pid_list *pid_list);
+bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid);
+int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid);
+int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid);
+int trace_pid_list_first(struct trace_pid_list *pid_list, unsigned int *pid);
+int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid,
+ unsigned int *next);
enum {
TRACE_PIDS = BIT(0),