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authorFam Zheng <famz@redhat.com>2016-10-13 17:58:22 -0400
committerMax Reitz <mreitz@redhat.com>2016-10-24 17:56:07 +0200
commit07ac4cdb570c9cf6aed0338414f4f09fee0b549c (patch)
tree675380ed98a96e976567990567d02f2f6aa884ae /util/hbitmap.c
parentdc162c8e4f088b08575460cca35b042d58c141aa (diff)
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HBitmap: Introduce "meta" bitmap to track bit changes
Upon each bit toggle, the corresponding bit in the meta bitmap will be set. Signed-off-by: Fam Zheng <famz@redhat.com> [Amended text inline. --js] Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: John Snow <jsnow@redhat.com> Message-id: 1476395910-8697-3-git-send-email-jsnow@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'util/hbitmap.c')
-rw-r--r--util/hbitmap.c69
1 files changed, 54 insertions, 15 deletions
diff --git a/util/hbitmap.c b/util/hbitmap.c
index 99fd2ba..f303975 100644
--- a/util/hbitmap.c
+++ b/util/hbitmap.c
@@ -78,6 +78,9 @@ struct HBitmap {
*/
int granularity;
+ /* A meta dirty bitmap to track the dirtiness of bits in this HBitmap. */
+ HBitmap *meta;
+
/* A number of progressively less coarse bitmaps (i.e. level 0 is the
* coarsest). Each bit in level N represents a word in level N+1 that
* has a set bit, except the last level where each bit represents the
@@ -209,25 +212,27 @@ static uint64_t hb_count_between(HBitmap *hb, uint64_t start, uint64_t last)
}
/* Setting starts at the last layer and propagates up if an element
- * changes from zero to non-zero.
+ * changes.
*/
static inline bool hb_set_elem(unsigned long *elem, uint64_t start, uint64_t last)
{
unsigned long mask;
- bool changed;
+ unsigned long old;
assert((last >> BITS_PER_LEVEL) == (start >> BITS_PER_LEVEL));
assert(start <= last);
mask = 2UL << (last & (BITS_PER_LONG - 1));
mask -= 1UL << (start & (BITS_PER_LONG - 1));
- changed = (*elem == 0);
+ old = *elem;
*elem |= mask;
- return changed;
+ return old != *elem;
}
-/* The recursive workhorse (the depth is limited to HBITMAP_LEVELS)... */
-static void hb_set_between(HBitmap *hb, int level, uint64_t start, uint64_t last)
+/* The recursive workhorse (the depth is limited to HBITMAP_LEVELS)...
+ * Returns true if at least one bit is changed. */
+static bool hb_set_between(HBitmap *hb, int level, uint64_t start,
+ uint64_t last)
{
size_t pos = start >> BITS_PER_LEVEL;
size_t lastpos = last >> BITS_PER_LEVEL;
@@ -256,23 +261,28 @@ static void hb_set_between(HBitmap *hb, int level, uint64_t start, uint64_t last
if (level > 0 && changed) {
hb_set_between(hb, level - 1, pos, lastpos);
}
+ return changed;
}
void hbitmap_set(HBitmap *hb, uint64_t start, uint64_t count)
{
/* Compute range in the last layer. */
+ uint64_t first, n;
uint64_t last = start + count - 1;
trace_hbitmap_set(hb, start, count,
start >> hb->granularity, last >> hb->granularity);
- start >>= hb->granularity;
+ first = start >> hb->granularity;
last >>= hb->granularity;
- count = last - start + 1;
assert(last < hb->size);
+ n = last - first + 1;
- hb->count += count - hb_count_between(hb, start, last);
- hb_set_between(hb, HBITMAP_LEVELS - 1, start, last);
+ hb->count += n - hb_count_between(hb, first, last);
+ if (hb_set_between(hb, HBITMAP_LEVELS - 1, first, last) &&
+ hb->meta) {
+ hbitmap_set(hb->meta, start, count);
+ }
}
/* Resetting works the other way round: propagate up if the new
@@ -293,8 +303,10 @@ static inline bool hb_reset_elem(unsigned long *elem, uint64_t start, uint64_t l
return blanked;
}
-/* The recursive workhorse (the depth is limited to HBITMAP_LEVELS)... */
-static void hb_reset_between(HBitmap *hb, int level, uint64_t start, uint64_t last)
+/* The recursive workhorse (the depth is limited to HBITMAP_LEVELS)...
+ * Returns true if at least one bit is changed. */
+static bool hb_reset_between(HBitmap *hb, int level, uint64_t start,
+ uint64_t last)
{
size_t pos = start >> BITS_PER_LEVEL;
size_t lastpos = last >> BITS_PER_LEVEL;
@@ -337,22 +349,29 @@ static void hb_reset_between(HBitmap *hb, int level, uint64_t start, uint64_t la
if (level > 0 && changed) {
hb_reset_between(hb, level - 1, pos, lastpos);
}
+
+ return changed;
+
}
void hbitmap_reset(HBitmap *hb, uint64_t start, uint64_t count)
{
/* Compute range in the last layer. */
+ uint64_t first;
uint64_t last = start + count - 1;
trace_hbitmap_reset(hb, start, count,
start >> hb->granularity, last >> hb->granularity);
- start >>= hb->granularity;
+ first = start >> hb->granularity;
last >>= hb->granularity;
assert(last < hb->size);
- hb->count -= hb_count_between(hb, start, last);
- hb_reset_between(hb, HBITMAP_LEVELS - 1, start, last);
+ hb->count -= hb_count_between(hb, first, last);
+ if (hb_reset_between(hb, HBITMAP_LEVELS - 1, first, last) &&
+ hb->meta) {
+ hbitmap_set(hb->meta, start, count);
+ }
}
void hbitmap_reset_all(HBitmap *hb)
@@ -381,6 +400,7 @@ bool hbitmap_get(const HBitmap *hb, uint64_t item)
void hbitmap_free(HBitmap *hb)
{
unsigned i;
+ assert(!hb->meta);
for (i = HBITMAP_LEVELS; i-- > 0; ) {
g_free(hb->levels[i]);
}
@@ -458,6 +478,9 @@ void hbitmap_truncate(HBitmap *hb, uint64_t size)
(size - old) * sizeof(*hb->levels[i]));
}
}
+ if (hb->meta) {
+ hbitmap_truncate(hb->meta, hb->size << hb->granularity);
+ }
}
@@ -493,3 +516,19 @@ bool hbitmap_merge(HBitmap *a, const HBitmap *b)
return true;
}
+
+HBitmap *hbitmap_create_meta(HBitmap *hb, int chunk_size)
+{
+ assert(!(chunk_size & (chunk_size - 1)));
+ assert(!hb->meta);
+ hb->meta = hbitmap_alloc(hb->size << hb->granularity,
+ hb->granularity + ctz32(chunk_size));
+ return hb->meta;
+}
+
+void hbitmap_free_meta(HBitmap *hb)
+{
+ assert(hb->meta);
+ hbitmap_free(hb->meta);
+ hb->meta = NULL;
+}