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authorDave Hansen <dave.hansen@linux.intel.com>2015-06-07 20:37:04 +0200
committerIngo Molnar <mingo@kernel.org>2015-06-09 12:24:32 +0200
commitcd4996dce18b619bd7b3acf75c91f49c77f05a97 (patch)
treea6c7e86ec06dd96684b9968b92336ee0f700579d /arch/x86
parentx86/mpx: Trace the attempts to find bounds tables (diff)
downloadlinux-cd4996dce18b619bd7b3acf75c91f49c77f05a97.tar.xz
linux-cd4996dce18b619bd7b3acf75c91f49c77f05a97.zip
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>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/include/asm/trace/mpx.h16
-rw-r--r--arch/x86/mm/mpx.c1
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/x86/include/asm/trace/mpx.h b/arch/x86/include/asm/trace/mpx.h
index c13c6fa3fa92..173dd3ba108c 100644
--- a/arch/x86/include/asm/trace/mpx.h
+++ b/arch/x86/include/asm/trace/mpx.h
@@ -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
/*
diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
index 55729ee9263e..c17fd27579af 100644
--- a/arch/x86/mm/mpx.c
+++ b/arch/x86/mm/mpx.c
@@ -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);