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perf tools: Add dedicated unwind addr_space member into thread struct

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Milian reported issue with thread::priv, which was double booked by perf
trace and DWARF unwind code. So using those together is impossible at
the moment.

Moving DWARF unwind private data into separate variable so perf trace
can keep using thread::priv.

Reported-and-Tested-by: Milian Wolff <milian.wolff@kdab.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andreas Hollmann <hollmann@in.tum.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1460013073-18444-2-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2016-04-07 09:11:12 +02:00 committed by Arnaldo Carvalho de Melo
parent 7d6a7e7825
commit e583d70c54
2 changed files with 15 additions and 16 deletions
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6
tools/perf/util/thread.h
View File

@ -9,6 +9,9 @@
#include "symbol.h"
#include <strlist.h>
#include <intlist.h>
#ifdef HAVE_LIBUNWIND_SUPPORT
#include <libunwind.h>
#endif
struct thread_stack;
@ -32,6 +35,9 @@ struct thread {
void *priv;
struct thread_stack *ts;
#ifdef HAVE_LIBUNWIND_SUPPORT
unw_addr_space_t addr_space;
#endif
};
struct machine;

25
tools/perf/util/unwind-libunwind.c
View File

@ -32,6 +32,7 @@
#include "symbol.h"
#include "util.h"
#include "debug.h"
#include "asm/bug.h"
extern int
UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as,
@ -580,43 +581,33 @@ static unw_accessors_t accessors = {
int unwind__prepare_access(struct thread *thread)
{
unw_addr_space_t addr_space;
if (callchain_param.record_mode != CALLCHAIN_DWARF)
return 0;
addr_space = unw_create_addr_space(&accessors, 0);
if (!addr_space) {
thread->addr_space = unw_create_addr_space(&accessors, 0);
if (!thread->addr_space) {
pr_err("unwind: Can't create unwind address space.\n");
return -ENOMEM;
}
unw_set_caching_policy(addr_space, UNW_CACHE_GLOBAL);
thread__set_priv(thread, addr_space);
unw_set_caching_policy(thread->addr_space, UNW_CACHE_GLOBAL);
return 0;
}
void unwind__flush_access(struct thread *thread)
{
unw_addr_space_t addr_space;
if (callchain_param.record_mode != CALLCHAIN_DWARF)
return;
addr_space = thread__priv(thread);
unw_flush_cache(addr_space, 0, 0);
unw_flush_cache(thread->addr_space, 0, 0);
}
void unwind__finish_access(struct thread *thread)
{
unw_addr_space_t addr_space;
if (callchain_param.record_mode != CALLCHAIN_DWARF)
return;
addr_space = thread__priv(thread);
unw_destroy_addr_space(addr_space);
unw_destroy_addr_space(thread->addr_space);
}
static int get_entries(struct unwind_info *ui, unwind_entry_cb_t cb,
@ -639,7 +630,9 @@ static int get_entries(struct unwind_info *ui, unwind_entry_cb_t cb,
* unwind itself.
*/
if (max_stack - 1 > 0) {
addr_space = thread__priv(ui->thread);
WARN_ONCE(!ui->thread, "WARNING: ui->thread is NULL");
addr_space = ui->thread->addr_space;
if (addr_space == NULL)
return -1;