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Why not just use the SHA1 only?Why not just use the SHA1 only?Posted May 23, 2010 10:57 UTC (Sun) by johill (subscriber, #25196)In reply to: Why not just use the SHA1 only? by rafal.maj Parent article: /dev/ksm: dynamic memory sharing Well, but you clearly didn't read the code:
+#define PAGECMP_OFFSET 128
+#define PAGEHASH_SIZE (PAGECMP_OFFSET ? PAGECMP_OFFSET : PAGE_SIZE)
+/* hash the page */
+static void page_hash(struct page *page, unsigned char *digest)
+{
+ struct scatterlist sg;
+ struct hash_desc desc;
+
+ sg_init_table(&sg, 1);
+ sg_set_page(&sg, page, PAGEHASH_SIZE, 0);
+ desc.tfm = tfm;
+ desc.flags = 0;
+ crypto_hash_digest(&desc, &sg, PAGEHASH_SIZE, digest);
+}
and it does "for sure" make sense since it's just a way to speed up matching, and just using 128 bytes means much less loading from memory. Tuning the 128 might make sense, potentially.
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