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Speedup memory un/locking

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Move the call of find_config_tree_node() from inner loop to outer
section of maps scanning.
This commit is contained in:
Zdenek Kabelac 2010-10-15 09:48:23 +00:00
parent 78725dd13a
commit d1ad03efce
1 changed files with 5 additions and 4 deletions
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9
lib/mm/memlock.c
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@ -121,10 +121,9 @@ static void _release_memory(void)
* mlock/munlock memory areas from /proc/self/maps
* format described in kernel/Documentation/filesystem/proc.txt
*/
static int _maps_line(struct cmd_context *cmd, lvmlock_t lock,
static int _maps_line(const struct config_node *cn, lvmlock_t lock,
const char* line, size_t* mstats)
{
const struct config_node *cn;
struct config_value *cv;
long from, to;
int pos, i;
@ -153,7 +152,7 @@ static int _maps_line(struct cmd_context *cmd, lvmlock_t lock,
}
sz = to - from;
if (!(cn = find_config_tree_node(cmd, "activation/mlock_filter"))) {
if (!cn) {
/* If no blacklist configured, use an internal set */
for (i = 0; i < sizeof(_blacklist_maps) / sizeof(_blacklist_maps[0]); ++i)
if (strstr(line + pos, _blacklist_maps[i])) {
@ -195,6 +194,7 @@ static int _maps_line(struct cmd_context *cmd, lvmlock_t lock,
static int _memlock_maps(struct cmd_context *cmd, lvmlock_t lock, size_t *mstats)
{
const struct config_node *cn;
char *line, *line_end;
size_t len;
ssize_t n;
@ -250,10 +250,11 @@ static int _memlock_maps(struct cmd_context *cmd, lvmlock_t lock, size_t *mstats
}
line = _maps_buffer;
cn = find_config_tree_node(cmd, "activation/mlock_filter");
while ((line_end = strchr(line, '\n'))) {
*line_end = '\0'; /* remove \n */
if (!_maps_line(cmd, lock, line, mstats))
if (!_maps_line(cn, lock, line, mstats))
ret = 0;
line = line_end + 1;
}