diff options
Diffstat (limited to 'Documentation/trace')
| -rw-r--r-- | Documentation/trace/ftrace.txt | 2 | ||||
| -rw-r--r-- | Documentation/trace/kprobetrace.txt | 10 |
2 files changed, 8 insertions, 4 deletions
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt index 006f47c7d913..94a987bd2bc5 100644 --- a/Documentation/trace/ftrace.txt +++ b/Documentation/trace/ftrace.txt @@ -1546,7 +1546,7 @@ Note, that the trace data shows the internal priority (99 - rtprio). <idle>-0 3d..3 5us : 0:120:R ==> [003] 2389: 94:R sleep -The 0:120:R means idle was running with a nice priority of 0 (120 - 20) +The 0:120:R means idle was running with a nice priority of 0 (120 - 120) and in the running state 'R'. The sleep task was scheduled in with 2389: 94:R. That is the priority is the kernel rtprio (99 - 5 = 94) and it too is in the running state. diff --git a/Documentation/trace/kprobetrace.txt b/Documentation/trace/kprobetrace.txt index 41ef9d8efe95..1a3a3d6bc2a8 100644 --- a/Documentation/trace/kprobetrace.txt +++ b/Documentation/trace/kprobetrace.txt @@ -8,8 +8,9 @@ Overview -------- These events are similar to tracepoint based events. Instead of Tracepoint, this is based on kprobes (kprobe and kretprobe). So it can probe wherever -kprobes can probe (this means, all functions body except for __kprobes -functions). Unlike the Tracepoint based event, this can be added and removed +kprobes can probe (this means, all functions except those with +__kprobes/nokprobe_inline annotation and those marked NOKPROBE_SYMBOL). +Unlike the Tracepoint based event, this can be added and removed dynamically, on the fly. To enable this feature, build your kernel with CONFIG_KPROBE_EVENTS=y. @@ -23,7 +24,7 @@ current_tracer. Instead of that, add probe points via Synopsis of kprobe_events ------------------------- p[:[GRP/]EVENT] [MOD:]SYM[+offs]|MEMADDR [FETCHARGS] : Set a probe - r[:[GRP/]EVENT] [MOD:]SYM[+0] [FETCHARGS] : Set a return probe + r[MAXACTIVE][:[GRP/]EVENT] [MOD:]SYM[+0] [FETCHARGS] : Set a return probe -:[GRP/]EVENT : Clear a probe GRP : Group name. If omitted, use "kprobes" for it. @@ -32,6 +33,9 @@ Synopsis of kprobe_events MOD : Module name which has given SYM. SYM[+offs] : Symbol+offset where the probe is inserted. MEMADDR : Address where the probe is inserted. + MAXACTIVE : Maximum number of instances of the specified function that + can be probed simultaneously, or 0 for the default value + as defined in Documentation/kprobes.txt section 1.3.1. FETCHARGS : Arguments. Each probe can have up to 128 args. %REG : Fetch register REG |