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Isolate the global pv list lock from data and other locks to prevent false

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sharing within the cache.
This commit is contained in:
Alan Cox 2012-06-02 22:14:10 +00:00
parent 2566e071ec
commit 0d6f49d84a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=236494
2 changed files with 22 additions and 2 deletions
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12
sys/amd64/amd64/pmap.c
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@ -199,13 +199,23 @@ u_int64_t KPML4phys; /* phys addr of kernel level 4 */
static u_int64_t DMPDphys; /* phys addr of direct mapped level 2 */
static u_int64_t DMPDPphys; /* phys addr of direct mapped level 3 */
/*
* 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 long pv_entry_count;
static struct md_page *pv_table;
static struct rwlock pvh_global_lock;
/*
* All those kernel PT submaps that BSD is so fond of

12
sys/i386/i386/pmap.c
View File

@ -231,13 +231,23 @@ SYSCTL_INT(_vm_pmap, OID_AUTO, pg_ps_enabled, CTLFLAG_RDTUN, &pg_ps_enabled, 0,
#define PAT_INDEX_SIZE 8
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 */