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authorHaavard Skinnemoen <hskinnemoen@atmel.com>2007-11-27 13:50:45 +0100
committerHaavard Skinnemoen <hskinnemoen@atmel.com>2008-01-25 08:31:39 +0100
commit13b54a50525a9685065684e1e11258d27dd27bdf (patch)
tree5cc2dbceb4efff1810e5425617ce9bc850e1e8cb /arch/avr32/kernel/ptrace.c
parent6ea6dd93c9454cc9521134f907bc970d09f460e4 (diff)
downloadop-kernel-dev-13b54a50525a9685065684e1e11258d27dd27bdf.zip
op-kernel-dev-13b54a50525a9685065684e1e11258d27dd27bdf.tar.gz
[AVR32] Enable debugging only when needed
Keep track of processes being debugged (including the kernel itself) and turn the OCD system on and off as appropriate. Since enabling debugging turns off some optimizations in the CPU core, this fixes the issue that enabling KProbes support or simply running a program under gdbserver will reduce system performance significantly until the next reboot. The CPU performance will still be reduced for all processes while a process is being debugged, but this is a lot better than reducing the performance forever. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Diffstat (limited to 'arch/avr32/kernel/ptrace.c')
-rw-r--r--arch/avr32/kernel/ptrace.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/avr32/kernel/ptrace.c b/arch/avr32/kernel/ptrace.c
index 002369e..1fed38f 100644
--- a/arch/avr32/kernel/ptrace.c
+++ b/arch/avr32/kernel/ptrace.c
@@ -58,6 +58,7 @@ void ptrace_disable(struct task_struct *child)
{
clear_tsk_thread_flag(child, TIF_SINGLE_STEP);
clear_tsk_thread_flag(child, TIF_BREAKPOINT);
+ ocd_disable(child);
}
/*
@@ -144,10 +145,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
int ret;
- pr_debug("ptrace: Enabling monitor mode...\n");
- ocd_write(DC, ocd_read(DC) | (1 << OCD_DC_MM_BIT)
- | (1 << OCD_DC_DBE_BIT));
-
switch (request) {
/* Read the word at location addr in the child process */
case PTRACE_PEEKTEXT:
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