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| author | Peter Rival <Frank.Rival@oracle.com> | 2010-04-23 13:26:05 -0400 |
|---|---|---|
| committer | Peter Rival <Frank.Rival@oracle.com> | 2010-04-23 13:26:05 -0400 |
| commit | cb15d5d96b3b2730714c28bfe06cfe7421758b8c (patch) | |
| tree | 7fd5c3cf5bb49647be8b2eb022e8d75a7d78eab5 /usr/src/uts/common/vm/anon.h | |
| parent | 03c76a6ef5c04e818b6badeeb6155961505af45c (diff) | |
| download | illumos-joyent-cb15d5d96b3b2730714c28bfe06cfe7421758b8c.tar.gz | |
6778289 vm locks need to scale with the size of system (strands/memory size)
Diffstat (limited to 'usr/src/uts/common/vm/anon.h')
| -rw-r--r-- | usr/src/uts/common/vm/anon.h | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/usr/src/uts/common/vm/anon.h b/usr/src/uts/common/vm/anon.h index 652fcc0951..a2e07d0b18 100644 --- a/usr/src/uts/common/vm/anon.h +++ b/usr/src/uts/common/vm/anon.h @@ -91,6 +91,11 @@ struct anon { int an_refcnt; /* # of people sharing slot */ }; +#define AN_CACHE_ALIGN_LOG2 4 /* log2(AN_CACHE_ALIGN) */ +#define AN_CACHE_ALIGN (1U << AN_CACHE_ALIGN_LOG2) /* anon address aligned */ + /* 16 bytes */ + + #ifdef _KERNEL /* * The swapinfo_lock protects: @@ -121,11 +126,24 @@ extern kcondvar_t anon_array_cv[]; * Global hash table to provide a function from (vp, off) -> ap */ extern size_t anon_hash_size; +extern unsigned int anon_hash_shift; extern struct anon **anon_hash; #define ANON_HASH_SIZE anon_hash_size #define ANON_HASHAVELEN 4 -#define ANON_HASH(VP, OFF) \ -((((uintptr_t)(VP) >> 7) ^ ((OFF) >> PAGESHIFT)) & (ANON_HASH_SIZE - 1)) +/* + * Try to use as many bits of randomness from both vp and off as we can. + * This should help spreading evenly for a variety of workloads. See comments + * for PAGE_HASH_FUNC for more explanation. + */ +#define ANON_HASH(vp, off) \ + (((((uintptr_t)(off) >> PAGESHIFT) ^ \ + ((uintptr_t)(off) >> (PAGESHIFT + anon_hash_shift))) ^ \ + (((uintptr_t)(vp) >> 3) ^ \ + ((uintptr_t)(vp) >> (3 + anon_hash_shift)) ^ \ + ((uintptr_t)(vp) >> (3 + 2 * anon_hash_shift)) ^ \ + ((uintptr_t)(vp) << \ + (anon_hash_shift - AN_VPSHIFT - VNODE_ALIGN_LOG2)))) & \ + (anon_hash_size - 1)) #define AH_LOCK_SIZE (2 << NCPU_LOG2) |