diff mbox

[dpdk-dev,PATCHv3] mempool: fix pages computation to determine number of objects

Message ID 1432716005-21290-1-git-send-email-konstantin.ananyev@intel.com (mailing list archive)
State Accepted, archived
Headers

Commit Message

Ananyev, Konstantin May 27, 2015, 8:40 a.m. UTC 
  v3:
- Fixed typo in the commit message.

v2:
- As suggested in comments use slightly different approach for the fix.

In rte_mempool_obj_iter(), when element boundary coincides with page boundary,
even if a single page is required per object, a loop checks that the next page
is contiguous and drops the first one otherwise.
This commit checks subsequent pages only when several are required per object.

Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
---
 lib/librte_mempool/rte_mempool.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

Comments

Thomas Monjalon May 29, 2015, 3:58 p.m. UTC | #1 
2015-05-27 09:40, Konstantin Ananyev:
> v3:
> - Fixed typo in the commit message.
> 
> v2:
> - As suggested in comments use slightly different approach for the fix.
> 
> In rte_mempool_obj_iter(), when element boundary coincides with page boundary,
> even if a single page is required per object, a loop checks that the next page
> is contiguous and drops the first one otherwise.
> This commit checks subsequent pages only when several are required per object.
> 
> Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

Applied, thanks
diff mbox

Patch

diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c
index 01972ba..ecb03b3 100644
--- a/lib/librte_mempool/rte_mempool.c
+++ b/lib/librte_mempool/rte_mempool.c
@@ -156,7 +156,7 @@  rte_mempool_obj_iter(void *vaddr, uint32_t elt_num, size_t elt_sz, size_t align,
 	rte_mempool_obj_iter_t obj_iter, void *obj_iter_arg)
 {
 	uint32_t i, j, k;
-	uint32_t pgn;
+	uint32_t pgn, pgf;
 	uintptr_t end, start, va;
 	uintptr_t pg_sz;
 
@@ -171,10 +171,14 @@  rte_mempool_obj_iter(void *vaddr, uint32_t elt_num, size_t elt_sz, size_t align,
 		start = RTE_ALIGN_CEIL(va, align);
 		end = start + elt_sz;
 
-		pgn = (end >> pg_shift) - (start >> pg_shift);
+		/* index of the first page for the next element. */
+		pgf = (end >> pg_shift) - (start >> pg_shift);
+
+		/* index of the last page for the current element. */
+		pgn = ((end - 1) >> pg_shift) - (start >> pg_shift);
 		pgn += j;
 
-		/* do we have enough space left for the next element. */
+		/* do we have enough space left for the element. */
 		if (pgn >= pg_num)
 			break;
 
@@ -194,7 +198,7 @@  rte_mempool_obj_iter(void *vaddr, uint32_t elt_num, size_t elt_sz, size_t align,
 				obj_iter(obj_iter_arg, (void *)start,
 					(void *)end, i);
 			va = end;
-			j = pgn;
+			j += pgf;
 			i++;
 		} else {
 			va = RTE_ALIGN_CEIL((va + 1), pg_sz);