Commit cd4996dc authored Jun 07, 2015 by Dave Hansen Committed by Ingo Molnar Jun 09, 2015

x86/mpx: Trace allocation of new bounds tables



Bounds tables are a significant consumer of memory.  It is
important to know when they are being allocated.  Add a trace
point to trace whenever an allocation occurs and also its
virtual address.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave@sr71.net>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150607183704.EC23A93E@viggo.jf.intel.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 2a1dcb1f

arch/x86/include/asm/trace/mpx.h

+16 −0

Original line number	Diff line number	Diff line
		@@ -95,6 +95,22 @@ DEFINE_EVENT(mpx_range_trace, mpx_unmap_search,
		TP_ARGS(start, end)
		);

		TRACE_EVENT(mpx_new_bounds_table,

		TP_PROTO(unsigned long table_vaddr),
		TP_ARGS(table_vaddr),

		TP_STRUCT__entry(
		__field(unsigned long, table_vaddr)
		),

		TP_fast_assign(
		__entry->table_vaddr = table_vaddr;
		),

		TP_printk("table vaddr:%p", (void *)__entry->table_vaddr)
		);

		#else

		/*

arch/x86/mm/mpx.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -483,6 +483,7 @@ static int allocate_bt(long __user *bd_entry)
		ret = -EINVAL;
		goto out_unmap;
		}
		trace_mpx_new_bounds_table(bt_addr);
		return 0;
		out_unmap:
		vm_munmap(bt_addr & MPX_BT_ADDR_MASK, MPX_BT_SIZE_BYTES);