D40326.id.diff
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D40326.id.diff
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	diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
	--- a/sys/amd64/amd64/pmap.c
	+++ b/sys/amd64/amd64/pmap.c
	@@ -8155,9 +8155,16 @@
	void
	pmap_zero_page(vm_page_t m)
	{
	- vm_offset_t va = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m));
	+ vm_offset_t va;

	+#ifdef TSLOG_PAGEZERO
	+ TSENTER();
	+#endif
	+ va = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m));
	pagezero((void *)va);
	+#ifdef TSLOG_PAGEZERO
	+ TSEXIT();
	+#endif
	}

	/*
	diff --git a/sys/conf/NOTES b/sys/conf/NOTES
	--- a/sys/conf/NOTES
	+++ b/sys/conf/NOTES
	@@ -615,6 +615,9 @@
	# before it is possible to use more sophisticated tools like DTrace.
	# The TSLOGSIZE option controls the size of the (preallocated, fixed
	# length) buffer used for storing these events (default: 262144 records).
	+# The TSLOG_PAGEZERO option enables TSLOG of pmap_zero_page; this must be
	+# enabled separately since it typically generates too many records to be
	+# useful.
	#
	# For security reasons the TSLOG option should not be enabled on systems
	# used in production.
	diff --git a/sys/conf/options b/sys/conf/options
	--- a/sys/conf/options
	+++ b/sys/conf/options
	@@ -67,6 +67,7 @@
	TEXTDUMP_PREFERRED opt_ddb.h
	TEXTDUMP_VERBOSE opt_ddb.h
	TSLOG opt_global.h
	+TSLOG_PAGEZERO opt_global.h
	TSLOGSIZE opt_global.h

	# Miscellaneous options.