diff options
Diffstat (limited to 'sys/i386')
| -rw-r--r-- | sys/i386/i386/pmap.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/sys/i386/i386/pmap.c b/sys/i386/i386/pmap.c index a81b492..c28efbc 100644 --- a/sys/i386/i386/pmap.c +++ b/sys/i386/i386/pmap.c @@ -232,12 +232,22 @@ SYSCTL_INT(_vm_pmap, OID_AUTO, pg_ps_enabled, CTLFLAG_RDTUN, &pg_ps_enabled, 0, static int pat_index[PAT_INDEX_SIZE]; /* cache mode to PAT index conversion */ /* + * Isolate the global pv list lock from data and other locks to prevent false + * sharing within the cache. + */ +static struct { + struct rwlock lock; + char padding[CACHE_LINE_SIZE - sizeof(struct rwlock)]; +} pvh_global __aligned(CACHE_LINE_SIZE); + +#define pvh_global_lock pvh_global.lock + +/* * Data for the pv entry allocation mechanism */ static TAILQ_HEAD(pch, pv_chunk) pv_chunks = TAILQ_HEAD_INITIALIZER(pv_chunks); static int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0; static struct md_page *pv_table; -static struct rwlock pvh_global_lock; static int shpgperproc = PMAP_SHPGPERPROC; struct pv_chunk *pv_chunkbase; /* KVA block for pv_chunks */ |
