59 lines
1.9 KiB
Diff
59 lines
1.9 KiB
Diff
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changeset: 23643:335e96664589
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user: George Dunlap <george.dunlap@eu.citrix.com>
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date: Fri Jul 01 20:31:18 2011 +0100
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files: xen/common/trace.c
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description:
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xentrace: Allow tracing to be enabled at boot
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Add a "tevt_mask" parameter to the xen command-line, allowing
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trace records to be gathered early in boot. They will be placed
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into the trace buffers, and read when the user runs "xentrace".
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Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
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---
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xen/common/trace.c | 20 ++++++++++++++++----
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1 file changed, 16 insertions(+), 4 deletions(-)
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Index: xen-4.1.2-testing/xen/common/trace.c
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===================================================================
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--- xen-4.1.2-testing.orig/xen/common/trace.c
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+++ xen-4.1.2-testing/xen/common/trace.c
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@@ -45,7 +45,9 @@ CHECK_t_buf;
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/* opt_tbuf_size: trace buffer size (in pages) for each cpu */
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static unsigned int opt_tbuf_size;
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+static unsigned int opt_tevt_mask;
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integer_param("tbuf_size", opt_tbuf_size);
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+integer_param("tevt_mask", opt_tevt_mask);
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/* Pointers to the meta-data objects for all system trace buffers */
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static struct t_info *t_info;
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@@ -338,11 +340,21 @@ void __init init_trace_bufs(void)
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{
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register_cpu_notifier(&cpu_nfb);
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- if ( opt_tbuf_size && alloc_trace_bufs(opt_tbuf_size) )
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+ if ( opt_tbuf_size )
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{
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- printk(XENLOG_INFO "xentrace: allocation size %d failed, disabling\n",
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- opt_tbuf_size);
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- opt_tbuf_size = 0;
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+ if ( alloc_trace_bufs(opt_tbuf_size) )
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+ {
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+ printk("xentrace: allocation size %d failed, disabling\n",
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+ opt_tbuf_size);
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+ opt_tbuf_size = 0;
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+ }
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+ else if ( opt_tevt_mask )
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+ {
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+ printk("xentrace: Starting tracing, enabling mask %x\n",
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+ opt_tevt_mask);
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+ tb_event_mask = opt_tevt_mask;
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+ tb_init_done=1;
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+ }
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}
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}
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