Author: pjd
Date: Thu Apr 21 13:35:20 2011
New Revision: 220923
URL: http://svn.freebsd.org/changeset/base/220923
Log:
If number of keys for the given provider doesn't exceed the limit,
allocate all of them at attach time. This allows to avoid moving
keys around in the most-recently-used queue and needs no mutex
synchronization nor refcounting.
MFC after: 2 weeks
Modified:
head/sys/geom/eli/g_eli_key_cache.c
Modified: head/sys/geom/eli/g_eli_key_cache.c
==============================================================================
--- head/sys/geom/eli/g_eli_key_cache.c Thu Apr 21 13:31:43 2011
(r220922)
+++ head/sys/geom/eli/g_eli_key_cache.c Thu Apr 21 13:35:20 2011
(r220923)
@@ -217,6 +217,16 @@ g_eli_key_init(struct g_eli_softc *sc)
sc->sc_ekeys_allocated = 0;
TAILQ_INIT(&sc->sc_ekeys_queue);
RB_INIT(&sc->sc_ekeys_tree);
+ if (sc->sc_ekeys_total <= g_eli_key_cache_limit) {
+ uint64_t keyno;
+
+ for (keyno = 0; keyno < sc->sc_ekeys_total; keyno++)
+ (void)g_eli_key_allocate(sc, keyno);
+ KASSERT(sc->sc_ekeys_total == sc->sc_ekeys_allocated,
+ ("sc_ekeys_total=%ju != sc_ekeys_allocated=%ju",
+ (uintmax_t)sc->sc_ekeys_total,
+ (uintmax_t)sc->sc_ekeys_allocated));
+ }
}
mtx_unlock(&sc->sc_ekeys_lock);
}
@@ -268,6 +278,13 @@ g_eli_key_hold(struct g_eli_softc *sc, o
keysearch.gek_keyno = keyno;
+ if (sc->sc_ekeys_total == sc->sc_ekeys_allocated) {
+ /* We have all the keys, so avoid some overhead. */
+ key = RB_FIND(g_eli_key_tree, &sc->sc_ekeys_tree, &keysearch);
+ KASSERT(key != NULL, ("No key %ju found.", (uintmax_t)keyno));
+ return (key->gek_key);
+ }
+
mtx_lock(&sc->sc_ekeys_lock);
key = RB_FIND(g_eli_key_tree, &sc->sc_ekeys_tree, &keysearch);
if (key != NULL) {
@@ -306,6 +323,9 @@ g_eli_key_drop(struct g_eli_softc *sc, u
if ((sc->sc_flags & G_ELI_FLAG_SINGLE_KEY) != 0)
return;
+ if (sc->sc_ekeys_total == sc->sc_ekeys_allocated)
+ return;
+
mtx_lock(&sc->sc_ekeys_lock);
KASSERT(key->gek_count > 0, ("key->gek_count=%d", key->gek_count));
key->gek_count--;
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