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Pack dmu_buf_impl_t by 16 bytes #16684

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merged 1 commit into from
Oct 25, 2024
Merged

Pack dmu_buf_impl_t by 16 bytes #16684

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53 changes: 24 additions & 29 deletions include/sys/dbuf.h
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Original file line number Diff line number Diff line change
Expand Up @@ -264,6 +264,27 @@ typedef struct dmu_buf_impl {
*/
uint8_t db_level;

/* This block was freed while a read or write was active. */
uint8_t db_freed_in_flight;

/*
* Evict user data as soon as the dirty and reference counts are equal.
*/
uint8_t db_user_immediate_evict;

/*
* dnode_evict_dbufs() or dnode_evict_bonus() tried to evict this dbuf,
* but couldn't due to outstanding references. Evict once the refcount
* drops to 0.
*/
uint8_t db_pending_evict;

/* Number of TXGs in which this buffer is dirty. */
uint8_t db_dirtycnt;

/* The buffer was partially read. More reads may follow. */
uint8_t db_partial_read;

/*
* Protects db_buf's contents if they contain an indirect block or data
* block of the meta-dnode. We use this lock to protect the structure of
Expand All @@ -288,6 +309,9 @@ typedef struct dmu_buf_impl {
*/
dbuf_states_t db_state;

/* In which dbuf cache this dbuf is, if any. */
dbuf_cached_state_t db_caching_status;

/*
* Refcount accessed by dmu_buf_{hold,rele}.
* If nonzero, the buffer can't be destroyed.
Expand All @@ -304,39 +328,10 @@ typedef struct dmu_buf_impl {
/* Link in dbuf_cache or dbuf_metadata_cache */
multilist_node_t db_cache_link;

/* Tells us which dbuf cache this dbuf is in, if any */
dbuf_cached_state_t db_caching_status;

uint64_t db_hash;

/* Data which is unique to data (leaf) blocks: */

/* User callback information. */
dmu_buf_user_t *db_user;

/*
* Evict user data as soon as the dirty and reference
* counts are equal.
*/
uint8_t db_user_immediate_evict;

/*
* This block was freed while a read or write was
* active.
*/
uint8_t db_freed_in_flight;

/*
* dnode_evict_dbufs() or dnode_evict_bonus() tried to
* evict this dbuf, but couldn't due to outstanding
* references. Evict once the refcount drops to 0.
*/
uint8_t db_pending_evict;

uint8_t db_dirtycnt;

/* The buffer was partially read. More reads may follow. */
uint8_t db_partial_read;
} dmu_buf_impl_t;

#define DBUF_HASH_MUTEX(h, idx) \
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