linux-kernel - [PATCH 11/19] x86, mpx: trace allocation of new bounds tables

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Message-Id: <20150519062532.B78B40F2@viggo.jf.intel.com>
Date:	Mon, 18 May 2015 23:25:32 -0700
From:	Dave Hansen <dave@...1.net>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, tglx@...utronix.de, Dave Hansen <dave@...1.net>,
	dave.hansen@...ux.intel.com
Subject: [PATCH 11/19] x86, mpx: trace allocation of new bounds tables


From: Dave Hansen <dave.hansen@...ux.intel.com>

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@...ux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>

---

 b/arch/x86/include/asm/trace/mpx.h |   16 ++++++++++++++++
 b/arch/x86/mm/mpx.c                |    1 +
 2 files changed, 17 insertions(+)

diff -puN arch/x86/include/asm/trace/mpx.h~trace_mpx_new_bounds_table arch/x86/include/asm/trace/mpx.h
--- a/arch/x86/include/asm/trace/mpx.h~trace_mpx_new_bounds_table	2015-05-18 17:49:01.996560861 -0700
+++ b/arch/x86/include/asm/trace/mpx.h	2015-05-18 17:49:02.001561087 -0700
@@ -94,6 +94,22 @@ DEFINE_EVENT(mpx_range_trace, mpx_unmap_
 	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 -puN arch/x86/mm/mpx.c~trace_mpx_new_bounds_table arch/x86/mm/mpx.c
--- a/arch/x86/mm/mpx.c~trace_mpx_new_bounds_table	2015-05-18 17:49:01.997560906 -0700
+++ b/arch/x86/mm/mpx.c	2015-05-18 17:49:02.001561087 -0700
@@ -483,6 +483,7 @@ static int allocate_bt(long __user *bd_e
 		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);
_
--
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