/* called with note_lock held */
static void oprof_output_map(ulong addr, ulong len, ulong offset,
struct file * file, int is_execve)
{
struct op_note note;
/* don't bother with /dev/zero mappings etc. */
if (!len)
return;
note.pid = current->pid;
note.tgid = op_get_tgid();
note.addr = addr;
note.len = len;
note.offset = offset;
note.type = is_execve ? OP_EXEC : OP_MAP;
note.hash = hash_path(file);
if (note.hash == -1)
return;
/* holding note lock */
__oprof_put_note(¬e);
}
/*
* Returns the basename of $path if it matches any of the $words,
* otherwise returns NULL. For low number of words this method
* was found faster than using a GHashTable: (135450000 iterations)
*
* match_words(): 14.780s
* GHashTable: 23.178s
*/
static char const *match_words(struct word_st const *words, char const *path)
{
struct word_st iword;
if (!words)
return 0;
hash_path(&iword, path);
do
{
if (iword.hash != words->hash)
continue;
else if (iword.length != words->length)
continue;
else if (memcmp(iword.word, words->word, iword.length))
continue;
else
return iword.word;
} while ((words = words->next) != NULL);
return NULL;
} /* match_words */
/**
* Small procedure to create a basic conjunctive query tree from a tokenised path.
*
* @param str Incoming path token.
* @param data A qelem** in disguise that should be updated.
* @return Always zero.
*/
static int _path_to_query_proc(const char *str, unsigned long data) {
DEBUG("str: \"%s\"", str);
qelem *newnode=NULL;
qelem **qroot=(qelem**)data;
int is_tag = get_tag(str);
unsigned long path_hash = hash_path(str);
int is_file = have_file_by_hash(path_hash);
if (is_tag) {
tdata dblock;
if (tree_read(is_tag, (tblock*)&dblock)) {
PMSG(LOG_ERR, "I/O error reading block\n");
qtree_free(qroot, 1);
return -EIO;
}
if (dblock.flags & DATA_FLAGS_NOSUB) {
newnode=_qtree_make_is_nosub(str);
} else {
newnode=_qtree_make_is(str);
}
} else if (is_file) {
newnode=_qtree_make_is_inode(path_hash);
} else {
DEBUG("Tag \"%s\" does not exist");
qtree_free(qroot, 1);
return -ENOENT;
}
if (*qroot) {
*qroot=_qtree_make_and(newnode, *qroot);
} else {
*qroot=newnode;
}
return 0;
}
