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Message-ID: <20141001024834.28985.5943.stgit@hemant-fedora>
Date: Wed, 01 Oct 2014 08:18:41 +0530
From: Hemant Kumar <hemant@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: srikar@...ux.vnet.ibm.com, peterz@...radead.org, oleg@...hat.com,
hegdevasant@...ux.vnet.ibm.com, mingo@...hat.com, anton@...hat.com,
systemtap@...rceware.org, namhyung@...nel.org,
masami.hiramatsu.pt@...achi.com, aravinda@...ux.vnet.ibm.com,
penberg@....fi
Subject: [PATCH v2 4/5] perf/sdt: Delete SDT events from cache
This patch adds the support to delete SDT events from the cache.
To delete an event corresponding to a file, first the cache is read into
the file_hash list. The key is calculated from the file name.
And then, the file_list for that file_hash entry is traversed to find out
the target file_list entry. Once, it is found, its contents are all freed up.
# ./perf sdt-cache --del /usr/lib64/libc-2.16.so
8 events removed for /usr/lib64/libc-2.16.so!
Signed-off-by: Hemant Kumar <hemant@...ux.vnet.ibm.com>
---
tools/perf/builtin-sdt-cache.c | 28 +++++++++++++++++++++++++++-
tools/perf/util/parse-events.h | 1 +
tools/perf/util/sdt.c | 35 +++++++++++++++++++++++++++++++++++
3 files changed, 63 insertions(+), 1 deletion(-)
diff --git a/tools/perf/builtin-sdt-cache.c b/tools/perf/builtin-sdt-cache.c
index 5faf8e5..12276da 100644
--- a/tools/perf/builtin-sdt-cache.c
+++ b/tools/perf/builtin-sdt-cache.c
@@ -16,6 +16,7 @@
/* Session management structure */
static struct {
bool add;
+ bool del;
bool dump;
const char *target;
} params;
@@ -29,6 +30,15 @@ static int opt_add_sdt_events(const struct option *opt __maybe_unused,
return 0;
}
+static int opt_del_sdt_events(const struct option *opt __maybe_unused,
+ const char *str, int unset __maybe_unused)
+{
+ params.del = true;
+ params.target = str;
+
+ return 0;
+}
+
static int opt_show_sdt_events(const struct option *opt __maybe_unused,
const char *str, int unset __maybe_unused)
{
@@ -45,13 +55,17 @@ int cmd_sdt_cache(int argc, const char **argv, const char *prefix __maybe_unused
OPT_CALLBACK('a', "add", NULL, "filename",
"add SDT events from a file.",
opt_add_sdt_events),
+ OPT_CALLBACK('d', "del", NULL, "filename",
+ "Remove SDT events corresponding to a file from the"
+ " sdt cache.",
+ opt_del_sdt_events),
OPT_CALLBACK_NOOPT('s', "dump", NULL, "show SDT events",
"Read SDT events from cache and display.",
opt_show_sdt_events),
OPT_END()
};
const char * const sdt_cache_usage[] = {
- "perf sdt_cache [--add filename | --dump]",
+ "perf sdt_cache [--add filename | --del filename | --dump]",
NULL
};
@@ -63,6 +77,10 @@ int cmd_sdt_cache(int argc, const char **argv, const char *prefix __maybe_unused
symbol__elf_init();
if (params.add) {
+ if (params.del) {
+ pr_err("Error: Don't use --del with --add\n");
+ usage_with_options(sdt_cache_usage, sdt_cache_options);
+ }
if (params.dump) {
pr_err("Error: Don't use --dump with --add\n");
usage_with_options(sdt_cache_usage, sdt_cache_options);
@@ -70,6 +88,14 @@ int cmd_sdt_cache(int argc, const char **argv, const char *prefix __maybe_unused
ret = add_sdt_events(params.target);
if (ret < 0)
pr_err("Cannot add SDT events to cache!\n");
+ } else if (params.del) {
+ if (params.dump) {
+ pr_err("Error: Don't use --dump with --del\n");
+ usage_with_options(sdt_cache_usage, sdt_cache_options);
+ }
+ ret = remove_sdt_events(params.target);
+ if (ret < 0)
+ pr_err("Cannot remove SDT events from cache!\n");
} else if (params.dump) {
if (argc == 0) {
ret = dump_sdt_events();
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index f43e6aa..2297af7 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -111,5 +111,6 @@ extern int valid_debugfs_mount(const char *debugfs);
int add_sdt_events(const char *file);
int dump_sdt_events(void);
+int remove_sdt_events(const char *str);
#endif /* __PERF_PARSE_EVENTS_H */
diff --git a/tools/perf/util/sdt.c b/tools/perf/util/sdt.c
index f2c7dc0..e8eea48 100644
--- a/tools/perf/util/sdt.c
+++ b/tools/perf/util/sdt.c
@@ -711,3 +711,38 @@ int dump_sdt_events(void)
file_hash_list__display(&file_hash);
return 0;
}
+
+/**
+ * remove_sdt_events: remove SDT events from cache
+ * @str: filename
+ *
+ * Removes the SDT events from the cache corresponding to the file name
+ * @str.
+ */
+int remove_sdt_events(const char *str)
+{
+ struct hash_list file_hash;
+ char *res_path;
+ int nr_del;
+
+ /* Initialize the hash_lists */
+ file_hash_list__init(&file_hash);
+ res_path = realpath(str, NULL);
+ if (!res_path)
+ return -ENOMEM;
+
+ /* Remove the file_list entry from file_hash and update the event_hash */
+ nr_del = file_hash_list__remove(&file_hash, res_path);
+ if (nr_del > 0) {
+ printf("%d events removed for %s!\n", nr_del, res_path);
+ flush_hash_list_to_cache(&file_hash);
+ goto out;
+ } else if (!nr_del) {
+ pr_err("Events for %s not found!\n", str);
+ }
+
+out:
+ free(res_path);
+ file_hash_list__cleanup(&file_hash);
+ return nr_del;
+}
--
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