Author: rwatson
Date: Sun Mar 29 03:30:15 2009
New Revision: 190518
URL: http://svn.freebsd.org/changeset/base/190518
Log:
Add SDT DTrace probes for VFS vnode operations in the vfs:vop
provider namespace. These are inserted dynamically into the
VOP_..._AP() functions created from vnode_if.src. Each VOP has
entry and return probes, as arg0 the primary vnode, arg1 the
vnode operation argument structure pointer, providing access to
IN and OUT arguments, and for return probes, arg2 the return
value.
MFC after: 1 month
Sponsored by: Google, Inc.
Modified:
head/sys/tools/vnode_if.awk
Modified: head/sys/tools/vnode_if.awk
==============================================================================
--- head/sys/tools/vnode_if.awk Sun Mar 29 01:04:13 2009 (r190517)
+++ head/sys/tools/vnode_if.awk Sun Mar 29 03:30:15 2009 (r190518)
@@ -165,12 +165,18 @@ if (hfile) {
if (cfile) {
printc(common_head \
+ "#include \"opt_kdtrace.h\"\n" \
+ "\n" \
"#include <sys/param.h>\n" \
"#include <sys/event.h>\n" \
+ "#include <sys/kernel.h>\n" \
"#include <sys/mount.h>\n" \
+ "#include <sys/sdt.h>\n" \
"#include <sys/systm.h>\n" \
"#include <sys/vnode.h>\n" \
"\n" \
+ "SDT_PROVIDER_DECLARE(vfs);\n" \
+ "\n" \
"struct vnodeop_desc vop_default_desc = {\n" \
" \"default\",\n" \
" 0,\n" \
@@ -348,6 +354,10 @@ while ((getline < srcfile) > 0) {
printc("\tVDESC_NO_OFFSET");
printc("};");
+ printc("\n");
+ printc("SDT_PROBE_DEFINE2(vfs, vop, " name ", entry, \"struct
vnode *\", \"struct " name "_args *\");\n");
+ printc("SDT_PROBE_DEFINE3(vfs, vop, " name ", return, \"struct
vnode *\", \"struct " name "_args *\", \"int\");\n");
+
# Print out function.
printc("\nint\n" uname "_AP(struct " name "_args *a)");
printc("{");
@@ -364,6 +374,7 @@ while ((getline < srcfile) > 0) {
printc("\t vop->"name" == NULL && vop->vop_bypass == NULL)")
printc("\t\tvop = vop->vop_default;")
printc("\tVNASSERT(vop != NULL, a->a_" args[0]", (\"No
"name"(%p, %p)\", a->a_" args[0]", a));")
+ printc("\tSDT_PROBE(vfs, vop, " name ", entry, a->a_" args[0]
", a, 0, 0, 0);\n");
for (i = 0; i < numargs; ++i)
add_debug_code(name, args[i], "Entry", "\t");
add_pre(name);
@@ -372,6 +383,7 @@ while ((getline < srcfile) > 0) {
printc("\telse")
printc("\t\trc = vop->vop_bypass(&a->a_gen);")
printc(ctrstr);
+ printc("\tSDT_PROBE(vfs, vop, " name ", return, a->a_" args[0]
", a, rc, 0, 0);\n");
printc("\tif (rc == 0) {");
for (i = 0; i < numargs; ++i)
add_debug_code(name, args[i], "OK", "\t\t");
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