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| author | Adrian Hunter <adrian.hunter@intel.com> | 2023-04-03 18:48:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-05-17 11:11:47 +0200 |
| commit | 1ff268fceab131952fe8fa6c45db34665cf5a80f (patch) | |
| tree | 8fb36629bf99ff61db794f7c82108c2bfa18526a | |
| parent | c9dfa8ba3b181e67970f06d80de18aa257d1ecda (diff) | |
| download | linux-1ff268fceab131952fe8fa6c45db34665cf5a80f.tar.gz linux-1ff268fceab131952fe8fa6c45db34665cf5a80f.tar.bz2 linux-1ff268fceab131952fe8fa6c45db34665cf5a80f.zip | |
perf auxtrace: Fix address filter entire kernel size
commit 1f9f33ccf0320be21703d9195dd2b36a1c9a07cb upstream.
kallsyms is not completely in address order.
In find_entire_kern_cb(), calculate the kernel end from the maximum
address not the last symbol.
Example:
Before:
$ sudo cat /proc/kallsyms | grep ' [twTw] ' | tail -1
ffffffffc00b8bd0 t bpf_prog_6deef7357e7b4530 [bpf]
$ sudo cat /proc/kallsyms | grep ' [twTw] ' | sort | tail -1
ffffffffc15e0cc0 t iwl_mvm_exit [iwlmvm]
$ perf.d093603a05aa record -v --kcore -e intel_pt// --filter 'filter *' -- uname |& grep filter
Address filter: filter 0xffffffff93200000/0x2ceba000
After:
$ perf.8fb0f7a01f8e record -v --kcore -e intel_pt// --filter 'filter *' -- uname |& grep filter
Address filter: filter 0xffffffff93200000/0x2e3e2000
Fixes: 1b36c03e356936d6 ("perf record: Add support for using symbols in address filters")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230403154831.8651-2-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | tools/perf/util/auxtrace.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c index e2cc45e5e4a1..295b0ff415d3 100644 --- a/tools/perf/util/auxtrace.c +++ b/tools/perf/util/auxtrace.c @@ -1776,6 +1776,7 @@ static int find_entire_kern_cb(void *arg, const char *name __maybe_unused, char type, u64 start) { struct sym_args *args = arg; + u64 size; if (!symbol_type__is_a(type, MAP__FUNCTION)) return 0; @@ -1785,7 +1786,9 @@ static int find_entire_kern_cb(void *arg, const char *name __maybe_unused, args->start = start; } /* Don't know exactly where the kernel ends, so we add a page */ - args->size = round_up(start, page_size) + page_size - args->start; + size = round_up(start, page_size) + page_size - args->start; + if (size > args->size) + args->size = size; return 0; } |