X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fjournal%2Fmmap-cache.c;h=117dc2f3a5b81c27cf5b8838de001e3cceda3340;hb=751bc6ac79320bc16e63e8c1bbb713c30a3b7bc9;hp=7813f037544546fe8bf8e33c85c6768acce001a0;hpb=89de694724f376a6852e879fe987e7e531327654;p=elogind.git

diff --git a/src/journal/mmap-cache.c b/src/journal/mmap-cache.c
index 7813f0375..117dc2f3a 100644
--- a/src/journal/mmap-cache.c
+++ b/src/journal/mmap-cache.c
@@ -41,9 +41,9 @@ struct Window {
         bool keep_always;
         bool in_unused;
 
+        int prot;
         void *ptr;
         uint64_t offset;
-        int prot;
         size_t size;
 
         FileDescriptor *fd;
@@ -70,12 +70,14 @@ struct FileDescriptor {
 
 struct MMapCache {
         int n_ref;
+        unsigned n_windows;
+
+        unsigned n_hit, n_missed;
+
 
         Hashmap *fds;
         Hashmap *contexts;
 
-        unsigned n_windows;
-
         LIST_HEAD(Window, unused);
         Window *last_unused;
 };
@@ -111,13 +113,13 @@ static void window_unlink(Window *w) {
                 munmap(w->ptr, w->size);
 
         if (w->fd)
-                LIST_REMOVE(Window, by_fd, w->fd->windows, w);
+                LIST_REMOVE(by_fd, w->fd->windows, w);
 
         if (w->in_unused) {
                 if (w->cache->last_unused == w)
                         w->cache->last_unused = w->unused_prev;
 
-                LIST_REMOVE(Window, unused, w->cache->unused, w);
+                LIST_REMOVE(unused, w->cache->unused, w);
         }
 
         LIST_FOREACH(by_window, c, w->contexts) {
@@ -134,7 +136,7 @@ static void window_free(Window *w) {
         free(w);
 }
 
-static bool window_matches(Window *w, int fd, int prot, uint64_t offset, size_t size) {
+_pure_ static bool window_matches(Window *w, int fd, int prot, uint64_t offset, size_t size) {
         assert(w);
         assert(fd >= 0);
         assert(size > 0);
@@ -181,11 +183,11 @@ static void context_detach_window(Context *c) {
 
         w = c->window;
         c->window = NULL;
-        LIST_REMOVE(Context, by_window, w->contexts, c);
+        LIST_REMOVE(by_window, w->contexts, c);
 
         if (!w->contexts && !w->keep_always) {
                 /* Not used anymore? */
-                LIST_PREPEND(Window, unused, c->cache->unused, w);
+                LIST_PREPEND(unused, c->cache->unused, w);
                 if (!c->cache->last_unused)
                         c->cache->last_unused = w;
 
@@ -204,15 +206,15 @@ static void context_attach_window(Context *c, Window *w) {
 
         if (w->in_unused) {
                 /* Used again? */
-                LIST_REMOVE(Window, unused, c->cache->unused, w);
-                if (!c->cache->last_unused)
-                        c->cache->last_unused = w;
+                LIST_REMOVE(unused, c->cache->unused, w);
+                if (c->cache->last_unused == w)
+                        c->cache->last_unused = w->unused_prev;
 
                 w->in_unused = false;
         }
 
         c->window = w;
-        LIST_PREPEND(Context, by_window, w->contexts, c);
+        LIST_PREPEND(by_window, w->contexts, c);
 }
 
 static Context *context_add(MMapCache *m, unsigned id) {
@@ -308,9 +310,13 @@ static void mmap_cache_free(MMapCache *m) {
         while ((c = hashmap_first(m->contexts)))
                 context_free(c);
 
+        hashmap_free(m->contexts);
+
         while ((f = hashmap_first(m->fds)))
                 fd_free(f);
 
+        hashmap_free(m->fds);
+
         while (m->unused)
                 window_free(m->unused);
 
@@ -508,11 +514,11 @@ static int add_mmap(
         w->size = wsize;
         w->fd = f;
 
-        LIST_PREPEND(Window, by_fd, f->windows, w);
+        LIST_PREPEND(by_fd, f->windows, w);
 
         context_detach_window(c);
         c->window = w;
-        LIST_PREPEND(Context, by_window, w->contexts, c);
+        LIST_PREPEND(by_window, w->contexts, c);
 
         *ret = (uint8_t*) w->ptr + (offset - w->offset);
         return 1;
@@ -539,13 +545,19 @@ int mmap_cache_get(
 
         /* Check whether the current context is the right one already */
         r = try_context(m, fd, prot, context, keep_always, offset, size, ret);
-        if (r != 0)
+        if (r != 0) {
+                m->n_hit ++;
                 return r;
+        }
 
         /* Search for a matching mmap */
         r = find_mmap(m, fd, prot, context, keep_always, offset, size, ret);
-        if (r != 0)
+        if (r != 0) {
+                m->n_hit ++;
                 return r;
+        }
+
+        m->n_missed++;
 
         /* Create a new mmap */
         return add_mmap(m, fd, prot, context, keep_always, offset, size, st, ret);
@@ -575,3 +587,15 @@ void mmap_cache_close_context(MMapCache *m, unsigned context) {
 
         context_free(c);
 }
+
+unsigned mmap_cache_get_hit(MMapCache *m) {
+        assert(m);
+
+        return m->n_hit;
+}
+
+unsigned mmap_cache_get_missed(MMapCache *m) {
+        assert(m);
+
+        return m->n_missed;
+}