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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>
This commit is contained in:
Dave Hansen 2015-06-07 11:37:04 -07:00 committed by Ingo Molnar
parent 2a1dcb1f79
commit cd4996dce1
2 changed files with 17 additions and 0 deletions
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16
arch/x86/include/asm/trace/mpx.h
View File

@ -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
/*

1
arch/x86/mm/mpx.c
View File

@ -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);