[PATCH 5/7 V3] idr: don't need to shink the free list when idr_remove()

From: Lai Jiangshan
Date: Tue Apr 22 2014 - 02:21:14 EST


After idr subsystem is changed to RCU-awared, the free layer will not go to
the free list. The free list will not be filled up when idr_remove().
So we don't need to shink it too.

Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
---
lib/idr.c | 16 ----------------
1 files changed, 0 insertions(+), 16 deletions(-)

diff --git a/lib/idr.c b/lib/idr.c
index e79e051..9ed37a7 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -18,12 +18,6 @@
* pointer or what ever, we treat it as a (void *). You can pass this
* id to a user for him to pass back at a later time. You then pass
* that id to this code and it returns your pointer.
-
- * You can release ids at any time. When all ids are released, most of
- * the memory is returned (we keep MAX_IDR_FREE) in a local pool so we
- * don't need to go to the memory "store" during an id allocate, just
- * so you don't need to be too concerned about locking and conflicts
- * with the slab allocator.
*/

#ifndef TEST // to test in user space...
@@ -584,16 +578,6 @@ void idr_remove(struct idr *idp, int id)
bitmap_clear(to_free->bitmap, 0, IDR_SIZE);
free_layer(idp, to_free);
}
- while (idp->id_free_cnt >= MAX_IDR_FREE) {
- p = get_from_free_list(idp);
- /*
- * Note: we don't call the rcu callback here, since the only
- * layers that fall into the freelist are those that have been
- * preallocated.
- */
- kmem_cache_free(idr_layer_cache, p);
- }
- return;
}
EXPORT_SYMBOL(idr_remove);

--
1.7.4.4

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