[S390] latencytop s390 support.

Cc: Holger Wolf <wolf@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index f0e7ccf..92a4f7b 100644 (file)
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -16,6 +16,9 @@ config LOCKDEP_SUPPORT
 config STACKTRACE_SUPPORT
        def_bool y
 
+config HAVE_LATENCYTOP_SUPPORT
+       def_bool y
+
 config RWSEM_GENERIC_SPINLOCK
        bool
 

diff --git a/arch/s390/kernel/stacktrace.c b/arch/s390/kernel/stacktrace.c
index da69247..85e46a5 100644 (file)
--- a/arch/s390/kernel/stacktrace.c
+++ b/arch/s390/kernel/stacktrace.c
@@ -14,7 +14,8 @@
 static unsigned long save_context_stack(struct stack_trace *trace,
                                        unsigned long sp,
                                        unsigned long low,
-                                       unsigned long high)
+                                       unsigned long high,
+                                       int savesched)
 {
        struct stack_frame *sf;
        struct pt_regs *regs;
@@ -47,10 +48,12 @@ static unsigned long save_context_stack(struct stack_trace *trace,
                        return sp;
                regs = (struct pt_regs *)sp;
                addr = regs->psw.addr & PSW_ADDR_INSN;
-               if (!trace->skip)
-                       trace->entries[trace->nr_entries++] = addr;
-               else
-                       trace->skip--;
+               if (savesched || !in_sched_functions(addr)) {
+                       if (!trace->skip)
+                               trace->entries[trace->nr_entries++] = addr;
+                       else
+                               trace->skip--;
+               }
                if (trace->nr_entries >= trace->max_entries)
                        return sp;
                low = sp;
@@ -66,15 +69,27 @@ void save_stack_trace(struct stack_trace *trace)
        orig_sp = sp & PSW_ADDR_INSN;
        new_sp = save_context_stack(trace, orig_sp,
                                    S390_lowcore.panic_stack - PAGE_SIZE,
-                                   S390_lowcore.panic_stack);
+                                   S390_lowcore.panic_stack, 1);
        if (new_sp != orig_sp)
                return;
        new_sp = save_context_stack(trace, new_sp,
                                    S390_lowcore.async_stack - ASYNC_SIZE,
-                                   S390_lowcore.async_stack);
+                                   S390_lowcore.async_stack, 1);
        if (new_sp != orig_sp)
                return;
        save_context_stack(trace, new_sp,
                           S390_lowcore.thread_info,
-                          S390_lowcore.thread_info + THREAD_SIZE);
+                          S390_lowcore.thread_info + THREAD_SIZE, 1);
+}
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+       unsigned long sp, low, high;
+
+       sp = tsk->thread.ksp & PSW_ADDR_INSN;
+       low = (unsigned long) task_stack_page(tsk);
+       high = (unsigned long) task_pt_regs(tsk);
+       save_context_stack(trace, sp, low, high, 0);
+       if (trace->nr_entries < trace->max_entries)
+               trace->entries[trace->nr_entries++] = ULONG_MAX;
 }