OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

perf probe: Support global variables 

Allow users to set external defined global variables as event arguments (e.g.
jiffies).

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <20101021101316.3542.1999.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu 2010-10-21 19:13:16 +09:00 committed by Arnaldo Carvalho de Melo
parent 378eeaad3e
commit 632941c4f8
1 changed files with 17 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
tools/perf/util/probe-finder.c
View File

@ -406,6 +406,9 @@ static int convert_variable_location(Dwarf_Die *vr_die, struct probe_finder *pf)
struct probe_trace_arg *tvar = pf->tvar;
int ret;
if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL)
goto static_var;
/* TODO: handle more than 1 exprs */
if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL ||
dwarf_getlocation_addr(&attr, pf->addr, &op, &nops, 1) <= 0 ||
@ -417,6 +420,7 @@ static int convert_variable_location(Dwarf_Die *vr_die, struct probe_finder *pf)
}
if (op->atom == DW_OP_addr) {
static_var:
/* Static variables on memory (not stack), make @varname */
ret = strlen(dwarf_diename(vr_die));
tvar->value = zalloc(ret + 2);
@ -746,17 +750,22 @@ static int find_variable(Dwarf_Die *sp_die, struct probe_finder *pf)
else {
/* Search upper class */
nscopes = dwarf_getscopes_die(sp_die, &scopes);
if (nscopes > 0) {
ret = dwarf_getscopevar(scopes, nscopes, pf->pvar->var,
0, NULL, 0, 0, &vr_die);
if (ret >= 0)
while (nscopes-- > 1) {
pr_debug("Searching variables in %s\n",
dwarf_diename(&scopes[nscopes]));
/* We should check this scope, so give dummy address */
if (die_find_variable_at(&scopes[nscopes],
pf->pvar->var, 0,
&vr_die)) {
ret = convert_variable(&vr_die, pf);
else
ret = -ENOENT;
goto found;
}
}
if (scopes)
free(scopes);
} else
ret = -ENOENT;
ret = -ENOENT;
}
found:
if (ret < 0)
pr_warning("Failed to find '%s' in this function.\n",
pf->pvar->var);