diff options
| author | Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> | 2010-10-21 19:13:16 +0900 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2010-10-21 15:58:27 -0200 |
| commit | 632941c4f8fbd5b90dcb1672cd0422dfd7332bc9 (patch) | |
| tree | 23aa4419c82a10a9a4de2d4672888d64d874b4ec /tools | |
| parent | 378eeaad3e1cfea7f6614018fb335de93df2ba1f (diff) | |
| download | lwn-632941c4f8fbd5b90dcb1672cd0422dfd7332bc9.tar.gz lwn-632941c4f8fbd5b90dcb1672cd0422dfd7332bc9.zip | |
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>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/probe-finder.c | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index abcaec555204..c6fe80ebb262 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -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); |