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annotate element struct with packing attributes to reduce entry size

This commit is contained in:
Vincent Sanders 2014-11-23 01:25:14 +00:00
parent 08c7ef6bed
commit 63c35da66e
1 changed files with 9 additions and 7 deletions
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16
content/fs_backing_store.c
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@ -119,21 +119,21 @@ enum store_entry_elem_flags {
* @note Order is important to avoid excessive structure packing overhead. * @note Order is important to avoid excessive structure packing overhead.
*/ */
struct store_entry_element { struct store_entry_element {
uint32_t size; /**< size of entry element on disc */
union { union {
struct { struct {
uint8_t* data; /**< data allocated on heap */ uint8_t* data; /**< data allocated on heap */
uint8_t ref; /**< reference count */ uint8_t ref; /**< reference count */
} heap; } __attribute__((__packed__)) heap;
struct { struct {
uint8_t* data; /**< data is from an mmapping */ uint8_t* data; /**< data is from an mmapping */
uint8_t ref; /**< reference count */ uint8_t ref; /**< reference count */
} map; } __attribute__((__packed__)) map;
struct { struct {
uint16_t block; /**< small object data block */ uint16_t block; /**< small object data block */
} small; } __attribute__((__packed__)) small;
} u; } u ;
uint8_t flags; /* extension flags */ uint8_t flags; /* extension flags */
uint32_t size; /**< size of entry element on disc */
}; };
/** /**
@ -923,8 +923,10 @@ read_entries(struct store_state *state)
entries_size = (1 << state->entry_bits) * sizeof(struct store_entry); entries_size = (1 << state->entry_bits) * sizeof(struct store_entry);
LOG(("Allocating %d bytes for max of %d entries", LOG(("Allocating %d bytes for max of %d entries of %d length elements %d length",
entries_size, 1 << state->entry_bits)); entries_size, 1 << state->entry_bits,
sizeof(struct store_entry),
sizeof(struct store_entry_element)));
state->entries = calloc(1, entries_size); state->entries = calloc(1, entries_size);
if (state->entries == NULL) { if (state->entries == NULL) {