From: Tetsu Yamamoto <tyamamot@redhat.com> Date: Tue, 26 Feb 2008 19:40:21 -0500 Subject: [xen] ia64: fix kprobes slowdown on single step Message-id: 47C4B175.5080605@redhat.com O-Subject: [RHEL5.2 PATCH] ia64 xen: Xen slows down and almost not respond when running some systemtap script Bugzilla: 434558 This is a fix for BZ#434558. https://bugzilla.redhat.com/show_bug.cgi?id=434558 The debug message on every singl step trap makes kprobe run slow. This patch remove the message which is actually just for xen developers. I've tested this with kernel -83 and confirmed that the message is not shown and kprobe works well. Please review and ACK. Regards, Tetsu Yamamoto Acked-by: "Stephen C. Tweedie" <sct@redhat.com> Acked-by: Chris Lalancette <clalance@redhat.com> Acked-by: Don Dutile <ddutile@redhat.com> diff --git a/arch/ia64/xen/faults.c b/arch/ia64/xen/faults.c index 77a71b1..2c7e234 100644 --- a/arch/ia64/xen/faults.c +++ b/arch/ia64/xen/faults.c @@ -716,7 +716,6 @@ ia64_handle_reflection(unsigned long ifa, struct pt_regs *regs, return; break; case 36: - printk("ia64_handle_reflection: handling single step trap\n"); vector = IA64_SINGLE_STEP_TRAP_VECTOR; if (debugger_trap_entry(vector,regs)) return;