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authorDave Hansen <dave@sr71.net>2014-07-31 19:40:59 +0400
committerH. Peter Anvin <hpa@linux.intel.com>2014-07-31 19:48:51 +0400
commitd17d8f9dedb9dd76fd540a5c497101529d9eb25a (patch)
tree9419fa5866856e22eb1fc26202085904556f346c /include/trace
parenta23421f111bb256cdbf23dcfe15f35567ab88e98 (diff)
downloadlinux-d17d8f9dedb9dd76fd540a5c497101529d9eb25a.tar.xz
x86/mm: Add tracepoints for TLB flushes
We don't have any good way to figure out what kinds of flushes are being attempted. Right now, we can try to use the vm counters, but those only tell us what we actually did with the hardware (one-by-one vs full) and don't tell us what was actually _requested_. This allows us to select out "interesting" TLB flushes that we might want to optimize (like the ranged ones) and ignore the ones that we have very little control over (the ones at context switch). Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Link: http://lkml.kernel.org/r/20140731154059.4C96CBA5@viggo.jf.intel.com Acked-by: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/tlb.h40
1 files changed, 40 insertions, 0 deletions
diff --git a/include/trace/events/tlb.h b/include/trace/events/tlb.h
new file mode 100644
index 000000000000..13391d288107
--- /dev/null
+++ b/include/trace/events/tlb.h
@@ -0,0 +1,40 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM tlb
+
+#if !defined(_TRACE_TLB_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_TLB_H
+
+#include <linux/mm_types.h>
+#include <linux/tracepoint.h>
+
+#define TLB_FLUSH_REASON \
+ { TLB_FLUSH_ON_TASK_SWITCH, "flush on task switch" }, \
+ { TLB_REMOTE_SHOOTDOWN, "remote shootdown" }, \
+ { TLB_LOCAL_SHOOTDOWN, "local shootdown" }, \
+ { TLB_LOCAL_MM_SHOOTDOWN, "local mm shootdown" }
+
+TRACE_EVENT(tlb_flush,
+
+ TP_PROTO(int reason, unsigned long pages),
+ TP_ARGS(reason, pages),
+
+ TP_STRUCT__entry(
+ __field( int, reason)
+ __field(unsigned long, pages)
+ ),
+
+ TP_fast_assign(
+ __entry->reason = reason;
+ __entry->pages = pages;
+ ),
+
+ TP_printk("pages:%ld reason:%s (%d)",
+ __entry->pages,
+ __print_symbolic(__entry->reason, TLB_FLUSH_REASON),
+ __entry->reason)
+);
+
+#endif /* _TRACE_TLB_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>