4b4fa7f68d
21317-xend-blkif-util-tap2.patch suse-disable-tap2-default.patch - Match upstreams cpu pools switch from domctl to sysctl - Upstream replacements for two of our custom patches (to ease applying further backports) - Fixed dump-exec-state.patch (could previously hang the system, as could - with lower probability - the un-patched implementation) - bnc#593536 - xen hypervisor takes very long to initialize Dom0 on 128 CPUs and 256Gb 21272-x86-dom0-alloc-performance.patch 21266-vmx-disabled-check.patch 21271-x86-cache-flush-global.patch - bnc#558815 - using multiple npiv luns with same wwpn/wwnn broken - bnc#601104 - Xen /etc/xen/scripts/block-npiv script fails when accessing multiple disks using NPIV block-npiv - bnc#595124 - VT-d can not be enabled on 32PAE Xen on Nehalem-EX platform 21234-x86-bad-srat-clear-pxm2node.patch bnc#585371 - kdump fails to load with xen: locate_hole failed 21235-crashkernel-advanced.patch - bnc#588918 - Attaching a U-disk to domain's failed by "xm usb-attach" init.xend OBS-URL: https://build.opensuse.org/package/show/Virtualization/xen?expand=0&rev=44
98 lines
2.9 KiB
Diff
98 lines
2.9 KiB
Diff
# HG changeset patch
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# User Keir Fraser <keir.fraser@citrix.com>
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# Date 1273143595 -3600
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# Node ID ccae861f52f7f25aa2ab404a6110831402845dac
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# Parent 924f54145fda26df64bf6f57010793893b29866f
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Reduce '0' debug key's global impact
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On large systems, dumping state may cause time management to get
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stalled for so long a period that it wouldn't recover. Therefore add
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a tasklet-based alternative mechanism to handle Dom0 state dumps.
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Signed-off-by: Jan Beulich <jbeulich@novell.com>
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--- a/xen/common/keyhandler.c
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+++ b/xen/common/keyhandler.c
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@@ -19,6 +19,7 @@
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static struct keyhandler *key_table[256];
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static unsigned char keypress_key;
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+static bool_t alt_key_handling;
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char keyhandler_scratch[1024];
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@@ -115,6 +116,26 @@ static struct keyhandler dump_registers_
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.desc = "dump registers"
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};
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+static DECLARE_TASKLET(dump_dom0_tasklet, NULL, 0);
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+
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+static void dump_dom0_action(unsigned long arg)
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+{
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+ struct vcpu *v = (void *)arg;
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+
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+ for ( ; ; )
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+ {
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+ vcpu_show_execution_state(v);
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+ if ( (v = v->next_in_list) == NULL )
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+ break;
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+ if ( softirq_pending(smp_processor_id()) )
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+ {
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+ dump_dom0_tasklet.data = (unsigned long)v;
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+ tasklet_schedule_on_cpu(&dump_dom0_tasklet, v->processor);
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+ break;
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+ }
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+ }
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+}
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+
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static void dump_dom0_registers(unsigned char key)
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{
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struct vcpu *v;
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@@ -125,7 +146,17 @@ static void dump_dom0_registers(unsigned
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printk("'%c' pressed -> dumping Dom0's registers\n", key);
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for_each_vcpu ( dom0, v )
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+ {
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+ if ( alt_key_handling && softirq_pending(smp_processor_id()) )
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+ {
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+ tasklet_kill(&dump_dom0_tasklet);
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+ tasklet_init(&dump_dom0_tasklet, dump_dom0_action,
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+ (unsigned long)v);
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+ tasklet_schedule_on_cpu(&dump_dom0_tasklet, v->processor);
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+ return;
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+ }
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vcpu_show_execution_state(v);
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+ }
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}
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static struct keyhandler dump_dom0_registers_keyhandler = {
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@@ -425,8 +456,28 @@ static struct keyhandler do_debug_key_ke
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.desc = "trap to xendbg"
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};
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+static void do_toggle_alt_key(unsigned char key, struct cpu_user_regs *regs)
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+{
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+ alt_key_handling = !alt_key_handling;
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+ printk("'%c' pressed -> using %s key handling\n", key,
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+ alt_key_handling ? "alternative" : "normal");
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+}
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+
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+static struct keyhandler toggle_alt_keyhandler = {
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+ .irq_callback = 1,
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+ .u.irq_fn = do_toggle_alt_key,
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+ .desc = "toggle alternative key handling"
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+};
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+
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void __init initialize_keytable(void)
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{
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+ if ( num_present_cpus() > 16 )
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+ {
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+ alt_key_handling = 1;
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+ printk(XENLOG_INFO "Defaulting to alternative key handling; "
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+ "send 'A' to switch to normal mode.\n");
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+ }
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+ register_keyhandler('A', &toggle_alt_keyhandler);
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register_keyhandler('d', &dump_registers_keyhandler);
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register_keyhandler('h', &show_handlers_keyhandler);
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register_keyhandler('q', &dump_domains_keyhandler);
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