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OpenZFS restructuring - ARC memory pressure

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Factor Linux specific memory pressure handling out of ARC.  Each
platform will have different available interfaces for managing memory
pressure.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Jorgen Lundman <lundman@lundman.net>
Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Closes #9472
This commit is contained in:
Matthew Macy
2019-10-18 10:23:19 -07:00
committed by Brian Behlendorf
parent 4313a5b4c5
commit c9c9c1e213
5 changed files with 527 additions and 438 deletions
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include/sys/arc_impl.h
+58
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@@ -30,6 +30,8 @@
#include <sys/arc.h>
#include <sys/zio_crypt.h>
#include <sys/zthr.h>
#include <sys/aggsum.h>
#ifdef __cplusplus
extern "C" {
@@ -554,6 +556,62 @@ typedef struct arc_stats {
kstat_named_t arcstat_raw_size;
} arc_stats_t;
typedef enum free_memory_reason_t {
FMR_UNKNOWN,
FMR_NEEDFREE,
FMR_LOTSFREE,
FMR_SWAPFS_MINFREE,
FMR_PAGES_PP_MAXIMUM,
FMR_HEAP_ARENA,
FMR_ZIO_ARENA,
} free_memory_reason_t;
#define ARCSTAT(stat) (arc_stats.stat.value.ui64)
#define ARCSTAT_INCR(stat, val) \
atomic_add_64(&arc_stats.stat.value.ui64, (val))
#define ARCSTAT_BUMP(stat) ARCSTAT_INCR(stat, 1)
#define ARCSTAT_BUMPDOWN(stat) ARCSTAT_INCR(stat, -1)
#define arc_no_grow ARCSTAT(arcstat_no_grow) /* do not grow cache size */
#define arc_p ARCSTAT(arcstat_p) /* target size of MRU */
#define arc_c ARCSTAT(arcstat_c) /* target size of cache */
#define arc_c_min ARCSTAT(arcstat_c_min) /* min target cache size */
#define arc_c_max ARCSTAT(arcstat_c_max) /* max target cache size */
#define arc_sys_free ARCSTAT(arcstat_sys_free) /* target system free bytes */
#define arc_need_free ARCSTAT(arcstat_need_free) /* bytes to be freed */
extern int arc_zio_arena_free_shift;
extern taskq_t *arc_prune_taskq;
extern arc_stats_t arc_stats;
extern hrtime_t arc_growtime;
extern boolean_t arc_warm;
extern int arc_grow_retry;
extern int arc_shrink_shift;
extern zthr_t *arc_adjust_zthr;
extern kmutex_t arc_adjust_lock;
extern kcondvar_t arc_adjust_waiters_cv;
extern boolean_t arc_adjust_needed;
extern kmutex_t arc_prune_mtx;
extern list_t arc_prune_list;
extern aggsum_t arc_size;
extern arc_state_t *arc_mfu;
extern arc_state_t *arc_mru;
extern uint_t zfs_arc_pc_percent;
extern int arc_lotsfree_percent;
extern void arc_reduce_target_size(int64_t to_free);
extern boolean_t arc_reclaim_needed(void);
extern void arc_kmem_reap_soon(void);
extern void arc_lowmem_init(void);
extern void arc_lowmem_fini(void);
extern void arc_prune_async(int64_t);
extern int arc_memory_throttle(spa_t *spa, uint64_t reserve, uint64_t txg);
extern uint64_t arc_free_memory(void);
extern int64_t arc_available_memory(void);
#ifdef __cplusplus
}
#endif