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authorBrian Foster <bfoster@redhat.com>2012-05-03 10:09:27 -0400
committerAnand Avati <avati@redhat.com>2012-05-08 15:34:01 -0700
commitd6244e238976e45ccb8c64ab4a0fe443fe44c952 (patch)
tree5a76de353d5c7e83319b39fd103c51487afcf714 /xlators/performance/md-cache
parent11a19ce031932640584f8bc207274f4e08d97c5f (diff)
quick-read, md-cache: selectively cache xattr data to conserve memory
The md-cache translator can cache items for a long period of time and thus is sensitive to memory usage associated with the items it references. This implements two changes to help conserve memory: - quick-read - Migrate the file content data to a local dict and delete from the xdata dict that passes through the stack. - md-cache - Create a local dict to selectively store the xattr data md-cache is interested in. This includes a slight optimization to not allocate an empty dict in the case where we have not received any xattr's of interest. I've tested both changes independently and together by running a readdirp test against several compiled source trees (~340k files). The base test results in a 7.7GB RSS on the client. The quick-read modification cuts RSS down to 4.1GB, which is still large due to md-cache unintelligently caching a large number of empty dictionaries. The combined modification cuts RSS down to 462MB on the same workload. NOTE: Theoretically the md-cache change should supercede the quick-read change, but practically I save an extra 150MB or so with both. I already had the change and consider it an improvement that quick-read clean up after itself. BUG: 812876 Change-Id: Id59734d12dd6476b0e32480939e633448adb6884 Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-on: http://review.gluster.com/3268 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Raghavendra G <raghavendra@gluster.com> Reviewed-by: Amar Tumballi <amarts@redhat.com> Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Diffstat (limited to 'xlators/performance/md-cache')
-rw-r--r--xlators/performance/md-cache/src/md-cache.c80
1 files changed, 74 insertions, 6 deletions
diff --git a/xlators/performance/md-cache/src/md-cache.c b/xlators/performance/md-cache/src/md-cache.c
index 9ef599ad8ba..5fcb583db27 100644
--- a/xlators/performance/md-cache/src/md-cache.c
+++ b/xlators/performance/md-cache/src/md-cache.c
@@ -441,12 +441,70 @@ out:
return ret;
}
+struct updatedict {
+ dict_t *dict;
+ int ret;
+};
+
+static void
+updatefn(dict_t *dict, char *key, data_t *value, void *data)
+{
+ struct updatedict *u = data;
+ const char *mdc_key;
+ int i = 0;
+
+ for (mdc_key = mdc_keys[i].name; (mdc_key = mdc_keys[i].name); i++) {
+ if (!mdc_keys[i].check)
+ continue;
+ if (strcmp(mdc_key, key))
+ continue;
+
+ if (!u->dict) {
+ u->dict = dict_new();
+ if (!u->dict) {
+ u->ret = -1;
+ return;
+ }
+ }
+
+ if (dict_set(u->dict, key, value) < 0) {
+ u->ret = -1;
+ return;
+ }
+
+ break;
+ }
+}
+
+static int
+mdc_dict_update(dict_t **tgt, dict_t *src)
+{
+ struct updatedict u = {
+ .dict = *tgt,
+ .ret = 0,
+ };
+
+ dict_foreach(src, updatefn, &u);
+
+ if (*tgt)
+ return u.ret;
+
+ if ((u.ret < 0) && u.dict) {
+ dict_unref(u.dict);
+ return u.ret;
+ }
+
+ *tgt = u.dict;
+
+ return u.ret;
+}
int
mdc_inode_xatt_set (xlator_t *this, inode_t *inode, dict_t *dict)
{
int ret = -1;
struct md_cache *mdc = NULL;
+ dict_t *newdict = NULL;
mdc = mdc_inode_prep (this, inode);
if (!mdc)
@@ -457,10 +515,19 @@ mdc_inode_xatt_set (xlator_t *this, inode_t *inode, dict_t *dict)
LOCK (&mdc->lock);
{
- if (mdc->xattr)
+ if (mdc->xattr) {
dict_unref (mdc->xattr);
+ mdc->xattr = NULL;
+ }
+
+ ret = mdc_dict_update(&newdict, dict);
+ if (ret < 0) {
+ UNLOCK(&mdc->lock);
+ goto out;
+ }
- mdc->xattr = dict_ref (dict);
+ if (newdict)
+ mdc->xattr = newdict;
time (&mdc->xa_time);
}
@@ -486,10 +553,11 @@ mdc_inode_xatt_update (xlator_t *this, inode_t *inode, dict_t *dict)
LOCK (&mdc->lock);
{
- if (!mdc->xattr)
- mdc->xattr = dict_ref (dict);
- else
- dict_copy (dict, mdc->xattr);
+ ret = mdc_dict_update(&mdc->xattr, dict);
+ if (ret < 0) {
+ UNLOCK(&mdc->lock);
+ goto out;
+ }
time (&mdc->xa_time);
}