FS-Cache: Add counters for entry/exit to/from cache operation functions
Count entries to and exits from cache operation table functions. Maintain
these as a single counter that's added to or removed from as appropriate.
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index c5973e3..250dfd3 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -71,7 +71,9 @@
if (fscache_object_is_active(object)) {
fscache_set_op_state(op, "CallFS");
+ fscache_stat(&fscache_n_cop_attr_changed);
ret = object->cache->ops->attr_changed(object);
+ fscache_stat_d(&fscache_n_cop_attr_changed);
fscache_set_op_state(op, "Done");
if (ret < 0)
fscache_abort_object(object);
@@ -300,11 +302,15 @@
/* ask the cache to honour the operation */
if (test_bit(FSCACHE_COOKIE_NO_DATA_YET, &object->cookie->flags)) {
+ fscache_stat(&fscache_n_cop_allocate_page);
ret = object->cache->ops->allocate_page(op, page, gfp);
+ fscache_stat_d(&fscache_n_cop_allocate_page);
if (ret == 0)
ret = -ENODATA;
} else {
+ fscache_stat(&fscache_n_cop_read_or_alloc_page);
ret = object->cache->ops->read_or_alloc_page(op, page, gfp);
+ fscache_stat_d(&fscache_n_cop_read_or_alloc_page);
}
if (ret == -ENOMEM)
@@ -358,7 +364,6 @@
void *context,
gfp_t gfp)
{
- fscache_pages_retrieval_func_t func;
struct fscache_retrieval *op;
struct fscache_object *object;
int ret;
@@ -413,11 +418,17 @@
}
/* ask the cache to honour the operation */
- if (test_bit(FSCACHE_COOKIE_NO_DATA_YET, &object->cookie->flags))
- func = object->cache->ops->allocate_pages;
- else
- func = object->cache->ops->read_or_alloc_pages;
- ret = func(op, pages, nr_pages, gfp);
+ if (test_bit(FSCACHE_COOKIE_NO_DATA_YET, &object->cookie->flags)) {
+ fscache_stat(&fscache_n_cop_allocate_pages);
+ ret = object->cache->ops->allocate_pages(
+ op, pages, nr_pages, gfp);
+ fscache_stat_d(&fscache_n_cop_allocate_pages);
+ } else {
+ fscache_stat(&fscache_n_cop_read_or_alloc_pages);
+ ret = object->cache->ops->read_or_alloc_pages(
+ op, pages, nr_pages, gfp);
+ fscache_stat_d(&fscache_n_cop_read_or_alloc_pages);
+ }
if (ret == -ENOMEM)
fscache_stat(&fscache_n_retrievals_nomem);
@@ -500,7 +511,9 @@
}
/* ask the cache to honour the operation */
+ fscache_stat(&fscache_n_cop_allocate_page);
ret = object->cache->ops->allocate_page(op, page, gfp);
+ fscache_stat_d(&fscache_n_cop_allocate_page);
if (ret < 0)
fscache_stat(&fscache_n_allocs_nobufs);
@@ -578,7 +591,9 @@
if (page) {
fscache_set_op_state(&op->op, "Store");
+ fscache_stat(&fscache_n_cop_write_page);
ret = object->cache->ops->write_page(op, page);
+ fscache_stat_d(&fscache_n_cop_write_page);
fscache_set_op_state(&op->op, "EndWrite");
fscache_end_page_write(cookie, page);
page_cache_release(page);
@@ -786,7 +801,9 @@
if (TestClearPageFsCache(page) &&
object->cache->ops->uncache_page) {
/* the cache backend releases the cookie lock */
+ fscache_stat(&fscache_n_cop_uncache_page);
object->cache->ops->uncache_page(object, page);
+ fscache_stat_d(&fscache_n_cop_uncache_page);
goto done;
}