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keys: Cache the hash value to avoid lots of recalculation

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Cache the hash of the key's type and description in the index key so that
we're not recalculating it every time we look at a key during a search.
The hash function does a bunch of multiplications, so evading those is
probably worthwhile - especially as this is done for every key examined
during a search.

This also allows the methods used by assoc_array to get chunks of index-key
to be simplified.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2019-06-26 21:02:32 +01:00
parent f771fde820
commit 355ef8e158
4 changed files with 25 additions and 16 deletions
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3
include/linux/key.h
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@ -86,6 +86,8 @@ struct keyring_list;
struct keyring_name;
struct keyring_index_key {
/* [!] If this structure is altered, the union in struct key must change too! */
unsigned long hash; /* Hash value */
union {
struct {
#ifdef __LITTLE_ENDIAN /* Put desc_len at the LSB of x */
@ -213,6 +215,7 @@ struct key {
union {
struct keyring_index_key index_key;
struct {
unsigned long hash;
unsigned long len_desc;
struct key_type *type; /* type of key */
char *description;