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-rw-r--r--tools/perf/util/dso.h50
1 files changed, 49 insertions, 1 deletions
diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index 38efe95a7fd..ad553ba257b 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -76,7 +76,6 @@ struct dso {
struct list_head node;
struct rb_root symbols[MAP__NR_TYPES];
struct rb_root symbol_names[MAP__NR_TYPES];
- struct rb_root cache;
void *a2l;
char *symsrc_filename;
unsigned int a2l_fails;
@@ -99,6 +98,15 @@ struct dso {
const char *long_name;
u16 long_name_len;
u16 short_name_len;
+
+ /* dso data file */
+ struct {
+ struct rb_root cache;
+ int fd;
+ size_t file_size;
+ struct list_head open_entry;
+ } data;
+
char name[0];
};
@@ -141,7 +149,47 @@ char dso__symtab_origin(const struct dso *dso);
int dso__read_binary_type_filename(const struct dso *dso, enum dso_binary_type type,
char *root_dir, char *filename, size_t size);
+/*
+ * The dso__data_* external interface provides following functions:
+ * dso__data_fd
+ * dso__data_close
+ * dso__data_read_offset
+ * dso__data_read_addr
+ *
+ * Please refer to the dso.c object code for each function and
+ * arguments documentation. Following text tries to explain the
+ * dso file descriptor caching.
+ *
+ * The dso__data* interface allows caching of opened file descriptors
+ * to speed up the dso data accesses. The idea is to leave the file
+ * descriptor opened ideally for the whole life of the dso object.
+ *
+ * The current usage of the dso__data_* interface is as follows:
+ *
+ * Get DSO's fd:
+ * int fd = dso__data_fd(dso, machine);
+ * USE 'fd' SOMEHOW
+ *
+ * Read DSO's data:
+ * n = dso__data_read_offset(dso_0, &machine, 0, buf, BUFSIZE);
+ * n = dso__data_read_addr(dso_0, &machine, 0, buf, BUFSIZE);
+ *
+ * Eventually close DSO's fd:
+ * dso__data_close(dso);
+ *
+ * It is not necessary to close the DSO object data file. Each time new
+ * DSO data file is opened, the limit (RLIMIT_NOFILE/2) is checked. Once
+ * it is crossed, the oldest opened DSO object is closed.
+ *
+ * The dso__delete function calls close_dso function to ensure the
+ * data file descriptor gets closed/unmapped before the dso object
+ * is freed.
+ *
+ * TODO
+*/
int dso__data_fd(struct dso *dso, struct machine *machine);
+void dso__data_close(struct dso *dso);
+
ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine,
u64 offset, u8 *data, ssize_t size);
ssize_t dso__data_read_addr(struct dso *dso, struct map *map,