From d17d8f9dedb9dd76fd540a5c497101529d9eb25a Mon Sep 17 00:00:00 2001 From: Dave Hansen Date: Thu, 31 Jul 2014 08:40:59 -0700 Subject: 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 Link: http://lkml.kernel.org/r/20140731154059.4C96CBA5@viggo.jf.intel.com Acked-by: Rik van Riel Cc: Mel Gorman Signed-off-by: H. Peter Anvin --- include/linux/mm_types.h | 8 ++++++++ include/trace/events/tlb.h | 40 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 48 insertions(+) create mode 100644 include/trace/events/tlb.h (limited to 'include') diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 96c5750e3110..796deac19fcf 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -516,4 +516,12 @@ struct vm_special_mapping struct page **pages; }; +enum tlb_flush_reason { + TLB_FLUSH_ON_TASK_SWITCH, + TLB_REMOTE_SHOOTDOWN, + TLB_LOCAL_SHOOTDOWN, + TLB_LOCAL_MM_SHOOTDOWN, + NR_TLB_FLUSH_REASONS, +}; + #endif /* _LINUX_MM_TYPES_H */ 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 +#include + +#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 -- cgit v1.2.3