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authorEric Dumazet <edumazet@google.com>2019-10-30 11:48:44 -0700
committerChristoph Hellwig <hch@lst.de>2019-11-11 10:52:18 +0100
commit5e76f564572b85735de4b75a5e73b514be2562be (patch)
tree95c35b5219632553bb218904da8bce60fe222626 /kernel/dma
parentd3694f30732fd2a334b93f087033c5a5836f7aba (diff)
downloadlinux-5e76f564572b85735de4b75a5e73b514be2562be.tar.bz2
dma-debug: increase HASH_SIZE
With modern NIC, it is not unusual having about ~256,000 active dma mappings and a hash size of 1024 buckets is too small. Forcing full cache line per bucket does not seem useful, especially now that we have contention on free_entries_lock for allocations and freeing of entries. Better use the space to fit more buckets. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'kernel/dma')
-rw-r--r--kernel/dma/debug.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index a5b85dabfb8c..004496654aaa 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -27,7 +27,7 @@
#include <asm/sections.h>
-#define HASH_SIZE 1024ULL
+#define HASH_SIZE 16384ULL
#define HASH_FN_SHIFT 13
#define HASH_FN_MASK (HASH_SIZE - 1)
@@ -87,7 +87,7 @@ typedef bool (*match_fn)(struct dma_debug_entry *, struct dma_debug_entry *);
struct hash_bucket {
struct list_head list;
spinlock_t lock;
-} ____cacheline_aligned_in_smp;
+};
/* Hash list to save the allocated dma addresses */
static struct hash_bucket dma_entry_hash[HASH_SIZE];