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Migrate the sf_buf allocator that is used by sendfile(2) and zero-copy

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sockets into machine-dependent files.  The rationale for this
migration is illustrated by the modified amd64 allocator.  It uses the
amd64's direct map to avoid emphemeral mappings in the kernel's
address space.  On an SMP, the emphemeral mappings result in an IPI
for TLB shootdown for each transmitted page.  Yuck.

Maintainers of other 64-bit platforms with direct maps should be able
to use the amd64 allocator as a reference implementation.
This commit is contained in:
Alan Cox 2003-08-29 20:04:10 +00:00
parent f8b417d763
commit 411d10a600
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=119563
8 changed files with 704 additions and 99 deletions
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101
sys/alpha/alpha/vm_machdep.c
View File

@ -82,6 +82,8 @@ __FBSDID("$FreeBSD$");
#include <sys/vnode.h>
#include <sys/vmmeter.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/unistd.h>
@ -101,6 +103,20 @@ __FBSDID("$FreeBSD$");
#include <sys/user.h>
static void sf_buf_init(void *arg);
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL)
/*
* Expanded sf_freelist head. Really an SLIST_HEAD() in disguise, with the
* sf_freelist head with the sf_lock mutex.
*/
static struct {
SLIST_HEAD(, sf_buf) sf_head;
struct mtx sf_lock;
} sf_freelist;
static u_int sf_buf_alloc_want;
/*
* Finish a fork operation, with process p2 nearly set up.
* Copy and update the pcb, set up the stack so that the child
@ -369,6 +385,91 @@ cpu_reset()
prom_halt(0);
}
/*
* Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
*/
static void
sf_buf_init(void *arg)
{
struct sf_buf *sf_bufs;
vm_offset_t sf_base;
int i;
mtx_init(&sf_freelist.sf_lock, "sf_bufs list lock", NULL, MTX_DEF);
mtx_lock(&sf_freelist.sf_lock);
SLIST_INIT(&sf_freelist.sf_head);
sf_base = kmem_alloc_nofault(kernel_map, nsfbufs * PAGE_SIZE);
sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP,
M_NOWAIT | M_ZERO);
for (i = 0; i < nsfbufs; i++) {
sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
SLIST_INSERT_HEAD(&sf_freelist.sf_head, &sf_bufs[i], free_list);
}
sf_buf_alloc_want = 0;
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Get an sf_buf from the freelist. Will block if none are available.
*/
struct sf_buf *
sf_buf_alloc(struct vm_page *m)
{
struct sf_buf *sf;
int error;
mtx_lock(&sf_freelist.sf_lock);
while ((sf = SLIST_FIRST(&sf_freelist.sf_head)) == NULL) {
sf_buf_alloc_want++;
error = msleep(&sf_freelist, &sf_freelist.sf_lock, PVM|PCATCH,
"sfbufa", 0);
sf_buf_alloc_want--;
/*
* If we got a signal, don't risk going back to sleep.
*/
if (error)
break;
}
if (sf != NULL) {
SLIST_REMOVE_HEAD(&sf_freelist.sf_head, free_list);
sf->m = m;
pmap_qenter(sf->kva, &sf->m, 1);
}
mtx_unlock(&sf_freelist.sf_lock);
return (sf);
}
/*
* Detatch mapped page and release resources back to the system.
*/
void
sf_buf_free(void *addr, void *args)
{
struct sf_buf *sf;
struct vm_page *m;
sf = args;
pmap_qremove((vm_offset_t)addr, 1);
m = sf->m;
vm_page_lock_queues();
vm_page_unwire(m, 0);
/*
* Check for the object going away on us. This can
* happen since we don't hold a reference to it.
* If so, we're responsible for freeing the page.
*/
if (m->wire_count == 0 && m->object == NULL)
vm_page_free(m);
vm_page_unlock_queues();
sf->m = NULL;
mtx_lock(&sf_freelist.sf_lock);
SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list);
if (sf_buf_alloc_want > 0)
wakeup_one(&sf_freelist);
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Software interrupt handler for queued VM system processing.
*/

95
sys/amd64/amd64/vm_machdep.c
View File

@ -57,7 +57,9 @@ __FBSDID("$FreeBSD$");
#include <sys/vmmeter.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/unistd.h>
@ -78,6 +80,19 @@ __FBSDID("$FreeBSD$");
#include <amd64/isa/isa.h>
static void cpu_reset_real(void);
static void sf_buf_init(void *arg);
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL)
/*
* Expanded sf_freelist head. Really an SLIST_HEAD() in disguise, with the
* sf_freelist head with the sf_lock mutex.
*/
static struct {
SLIST_HEAD(, sf_buf) sf_head;
struct mtx sf_lock;
} sf_freelist;
static u_int sf_buf_alloc_want;
/*
* Finish a fork operation, with process p2 nearly set up.
@ -348,6 +363,86 @@ cpu_reset_real()
while(1);
}
/*
* Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
*/
static void
sf_buf_init(void *arg)
{
struct sf_buf *sf_bufs;
int i;
mtx_init(&sf_freelist.sf_lock, "sf_bufs list lock", NULL, MTX_DEF);
mtx_lock(&sf_freelist.sf_lock);
SLIST_INIT(&sf_freelist.sf_head);
sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP,
M_NOWAIT | M_ZERO);
for (i = 0; i < nsfbufs; i++)
SLIST_INSERT_HEAD(&sf_freelist.sf_head, &sf_bufs[i], free_list);
sf_buf_alloc_want = 0;
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Get an sf_buf from the freelist. Will block if none are available.
*/
struct sf_buf *
sf_buf_alloc(struct vm_page *m)
{
struct sf_buf *sf;
int error;
mtx_lock(&sf_freelist.sf_lock);
while ((sf = SLIST_FIRST(&sf_freelist.sf_head)) == NULL) {
sf_buf_alloc_want++;
error = msleep(&sf_freelist, &sf_freelist.sf_lock, PVM|PCATCH,
"sfbufa", 0);
sf_buf_alloc_want--;
/*
* If we got a signal, don't risk going back to sleep.
*/
if (error)
break;
}
if (sf != NULL) {
SLIST_REMOVE_HEAD(&sf_freelist.sf_head, free_list);
sf->m = m;
sf->kva = PHYS_TO_DMAP(m->phys_addr);
}
mtx_unlock(&sf_freelist.sf_lock);
return (sf);
}
/*
* Detatch mapped page and release resources back to the system.
*/
void
sf_buf_free(void *addr, void *args)
{
struct sf_buf *sf;
struct vm_page *m;
sf = args;
m = sf->m;
vm_page_lock_queues();
vm_page_unwire(m, 0);
/*
* Check for the object going away on us. This can
* happen since we don't hold a reference to it.
* If so, we're responsible for freeing the page.
*/
if (m->wire_count == 0 && m->object == NULL)
vm_page_free(m);
vm_page_unlock_queues();
sf->m = NULL;
mtx_lock(&sf_freelist.sf_lock);
SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list);
if (sf_buf_alloc_want > 0)
wakeup_one(&sf_freelist);
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Software interrupt handler for queued VM system processing.
*/

101
sys/i386/i386/vm_machdep.c
View File

@ -62,8 +62,10 @@ __FBSDID("$FreeBSD$");
#include <sys/vmmeter.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/smp.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/unistd.h>
@ -95,6 +97,20 @@ static void cpu_reset_proxy(void);
static u_int cpu_reset_proxyid;
static volatile u_int cpu_reset_proxy_active;
#endif
static void sf_buf_init(void *arg);
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL)
/*
* Expanded sf_freelist head. Really an SLIST_HEAD() in disguise, with the
* sf_freelist head with the sf_lock mutex.
*/
static struct {
SLIST_HEAD(, sf_buf) sf_head;
struct mtx sf_lock;
} sf_freelist;
static u_int sf_buf_alloc_want;
extern int _ucodesel, _udatasel;
/*
@ -547,6 +563,91 @@ cpu_reset_real()
while(1);
}
/*
* Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
*/
static void
sf_buf_init(void *arg)
{
struct sf_buf *sf_bufs;
vm_offset_t sf_base;
int i;
mtx_init(&sf_freelist.sf_lock, "sf_bufs list lock", NULL, MTX_DEF);
mtx_lock(&sf_freelist.sf_lock);
SLIST_INIT(&sf_freelist.sf_head);
sf_base = kmem_alloc_nofault(kernel_map, nsfbufs * PAGE_SIZE);
sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP,
M_NOWAIT | M_ZERO);
for (i = 0; i < nsfbufs; i++) {
sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
SLIST_INSERT_HEAD(&sf_freelist.sf_head, &sf_bufs[i], free_list);
}
sf_buf_alloc_want = 0;
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Get an sf_buf from the freelist. Will block if none are available.
*/
struct sf_buf *
sf_buf_alloc(struct vm_page *m)
{
struct sf_buf *sf;
int error;
mtx_lock(&sf_freelist.sf_lock);
while ((sf = SLIST_FIRST(&sf_freelist.sf_head)) == NULL) {
sf_buf_alloc_want++;
error = msleep(&sf_freelist, &sf_freelist.sf_lock, PVM|PCATCH,
"sfbufa", 0);
sf_buf_alloc_want--;
/*
* If we got a signal, don't risk going back to sleep.
*/
if (error)
break;
}
if (sf != NULL) {
SLIST_REMOVE_HEAD(&sf_freelist.sf_head, free_list);
sf->m = m;
pmap_qenter(sf->kva, &sf->m, 1);
}
mtx_unlock(&sf_freelist.sf_lock);
return (sf);
}
/*
* Detatch mapped page and release resources back to the system.
*/
void
sf_buf_free(void *addr, void *args)
{
struct sf_buf *sf;
struct vm_page *m;
sf = args;
pmap_qremove((vm_offset_t)addr, 1);
m = sf->m;
vm_page_lock_queues();
vm_page_unwire(m, 0);
/*
* Check for the object going away on us. This can
* happen since we don't hold a reference to it.
* If so, we're responsible for freeing the page.
*/
if (m->wire_count == 0 && m->object == NULL)
vm_page_free(m);
vm_page_unlock_queues();
sf->m = NULL;
mtx_lock(&sf_freelist.sf_lock);
SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list);
if (sf_buf_alloc_want > 0)
wakeup_one(&sf_freelist);
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Software interrupt handler for queued VM system processing.
*/

101
sys/ia64/ia64/vm_machdep.c
View File

@ -78,6 +78,8 @@
#include <sys/vnode.h>
#include <sys/vmmeter.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/unistd.h>
@ -98,6 +100,20 @@
#include <i386/include/psl.h>
static void sf_buf_init(void *arg);
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL)
/*
* Expanded sf_freelist head. Really an SLIST_HEAD() in disguise, with the
* sf_freelist head with the sf_lock mutex.
*/
static struct {
SLIST_HEAD(, sf_buf) sf_head;
struct mtx sf_lock;
} sf_freelist;
static u_int sf_buf_alloc_want;
void
cpu_thread_exit(struct thread *td)
{
@ -306,6 +322,91 @@ cpu_sched_exit(td)
{
}
/*
* Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
*/
static void
sf_buf_init(void *arg)
{
struct sf_buf *sf_bufs;
vm_offset_t sf_base;
int i;
mtx_init(&sf_freelist.sf_lock, "sf_bufs list lock", NULL, MTX_DEF);
mtx_lock(&sf_freelist.sf_lock);
SLIST_INIT(&sf_freelist.sf_head);
sf_base = kmem_alloc_nofault(kernel_map, nsfbufs * PAGE_SIZE);
sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP,
M_NOWAIT | M_ZERO);
for (i = 0; i < nsfbufs; i++) {
sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
SLIST_INSERT_HEAD(&sf_freelist.sf_head, &sf_bufs[i], free_list);
}
sf_buf_alloc_want = 0;
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Get an sf_buf from the freelist. Will block if none are available.
*/
struct sf_buf *
sf_buf_alloc(struct vm_page *m)
{
struct sf_buf *sf;
int error;
mtx_lock(&sf_freelist.sf_lock);
while ((sf = SLIST_FIRST(&sf_freelist.sf_head)) == NULL) {
sf_buf_alloc_want++;
error = msleep(&sf_freelist, &sf_freelist.sf_lock, PVM|PCATCH,
"sfbufa", 0);
sf_buf_alloc_want--;
/*
* If we got a signal, don't risk going back to sleep.
*/
if (error)
break;
}
if (sf != NULL) {
SLIST_REMOVE_HEAD(&sf_freelist.sf_head, free_list);
sf->m = m;
pmap_qenter(sf->kva, &sf->m, 1);
}
mtx_unlock(&sf_freelist.sf_lock);
return (sf);
}
/*
* Detatch mapped page and release resources back to the system.
*/
void
sf_buf_free(void *addr, void *args)
{
struct sf_buf *sf;
struct vm_page *m;
sf = args;
pmap_qremove((vm_offset_t)addr, 1);
m = sf->m;
vm_page_lock_queues();
vm_page_unwire(m, 0);
/*
* Check for the object going away on us. This can
* happen since we don't hold a reference to it.
* If so, we're responsible for freeing the page.
*/
if (m->wire_count == 0 && m->object == NULL)
vm_page_free(m);
vm_page_unlock_queues();
sf->m = NULL;
mtx_lock(&sf_freelist.sf_lock);
SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list);
if (sf_buf_alloc_want > 0)
wakeup_one(&sf_freelist);
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Software interrupt handler for queued VM system processing.
*/

99
sys/kern/uipc_syscalls.c
View File

@ -77,9 +77,6 @@ __FBSDID("$FreeBSD$");
#include <vm/vm_kern.h>
#include <vm/vm_extern.h>
static void sf_buf_init(void *arg);
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL)
static int sendit(struct thread *td, int s, struct msghdr *mp, int flags);
static int recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp);
@ -90,17 +87,6 @@ static int getsockname1(struct thread *td, struct getsockname_args *uap,
static int getpeername1(struct thread *td, struct getpeername_args *uap,
int compat);
/*
* Expanded sf_freelist head. Really an SLIST_HEAD() in disguise, with the
* sf_freelist head with the sf_lock mutex.
*/
static struct {
SLIST_HEAD(, sf_buf) sf_head;
struct mtx sf_lock;
} sf_freelist;
static u_int sf_buf_alloc_want;
/*
* System call interface to the socket abstraction.
*/
@ -1631,91 +1617,6 @@ getsockaddr(namp, uaddr, len)
return error;
}
/*
* Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
*/
static void
sf_buf_init(void *arg)
{
struct sf_buf *sf_bufs;
vm_offset_t sf_base;
int i;
mtx_init(&sf_freelist.sf_lock, "sf_bufs list lock", NULL, MTX_DEF);
mtx_lock(&sf_freelist.sf_lock);
SLIST_INIT(&sf_freelist.sf_head);
sf_base = kmem_alloc_nofault(kernel_map, nsfbufs * PAGE_SIZE);
sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP,
M_NOWAIT | M_ZERO);
for (i = 0; i < nsfbufs; i++) {
sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
SLIST_INSERT_HEAD(&sf_freelist.sf_head, &sf_bufs[i], free_list);
}
sf_buf_alloc_want = 0;
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Get an sf_buf from the freelist. Will block if none are available.
*/
struct sf_buf *
sf_buf_alloc(struct vm_page *m)
{
struct sf_buf *sf;
int error;
mtx_lock(&sf_freelist.sf_lock);
while ((sf = SLIST_FIRST(&sf_freelist.sf_head)) == NULL) {
sf_buf_alloc_want++;
error = msleep(&sf_freelist, &sf_freelist.sf_lock, PVM|PCATCH,
"sfbufa", 0);
sf_buf_alloc_want--;
/*
* If we got a signal, don't risk going back to sleep.
*/
if (error)
break;
}
if (sf != NULL) {
SLIST_REMOVE_HEAD(&sf_freelist.sf_head, free_list);
sf->m = m;
pmap_qenter(sf->kva, &sf->m, 1);
}
mtx_unlock(&sf_freelist.sf_lock);
return (sf);
}
/*
* Detatch mapped page and release resources back to the system.
*/
void
sf_buf_free(void *addr, void *args)
{
struct sf_buf *sf;
struct vm_page *m;
sf = args;
pmap_qremove((vm_offset_t)addr, 1);
m = sf->m;
vm_page_lock_queues();
vm_page_unwire(m, 0);
/*
* Check for the object going away on us. This can
* happen since we don't hold a reference to it.
* If so, we're responsible for freeing the page.
*/
if (m->wire_count == 0 && m->object == NULL)
vm_page_free(m);
vm_page_unlock_queues();
sf->m = NULL;
mtx_lock(&sf_freelist.sf_lock);
SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list);
if (sf_buf_alloc_want > 0)
wakeup_one(&sf_freelist);
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* sendfile(2)
*

101
sys/powerpc/aim/vm_machdep.c
View File

@ -81,6 +81,8 @@
#include <sys/vnode.h>
#include <sys/vmmeter.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/unistd.h>
@ -101,6 +103,20 @@
#include <sys/user.h>
static void sf_buf_init(void *arg);
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL)
/*
* Expanded sf_freelist head. Really an SLIST_HEAD() in disguise, with the
* sf_freelist head with the sf_lock mutex.
*/
static struct {
SLIST_HEAD(, sf_buf) sf_head;
struct mtx sf_lock;
} sf_freelist;
static u_int sf_buf_alloc_want;
/*
* Finish a fork operation, with process p2 nearly set up.
* Copy and update the pcb, set up the stack so that the child
@ -219,6 +235,91 @@ cpu_reset()
OF_exit();
}
/*
* Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
*/
static void
sf_buf_init(void *arg)
{
struct sf_buf *sf_bufs;
vm_offset_t sf_base;
int i;
mtx_init(&sf_freelist.sf_lock, "sf_bufs list lock", NULL, MTX_DEF);
mtx_lock(&sf_freelist.sf_lock);
SLIST_INIT(&sf_freelist.sf_head);
sf_base = kmem_alloc_nofault(kernel_map, nsfbufs * PAGE_SIZE);
sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP,
M_NOWAIT | M_ZERO);
for (i = 0; i < nsfbufs; i++) {
sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
SLIST_INSERT_HEAD(&sf_freelist.sf_head, &sf_bufs[i], free_list);
}
sf_buf_alloc_want = 0;
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Get an sf_buf from the freelist. Will block if none are available.
*/
struct sf_buf *
sf_buf_alloc(struct vm_page *m)
{
struct sf_buf *sf;
int error;
mtx_lock(&sf_freelist.sf_lock);
while ((sf = SLIST_FIRST(&sf_freelist.sf_head)) == NULL) {
sf_buf_alloc_want++;
error = msleep(&sf_freelist, &sf_freelist.sf_lock, PVM|PCATCH,
"sfbufa", 0);
sf_buf_alloc_want--;
/*
* If we got a signal, don't risk going back to sleep.
*/
if (error)
break;
}
if (sf != NULL) {
SLIST_REMOVE_HEAD(&sf_freelist.sf_head, free_list);
sf->m = m;
pmap_qenter(sf->kva, &sf->m, 1);
}
mtx_unlock(&sf_freelist.sf_lock);
return (sf);
}
/*
* Detatch mapped page and release resources back to the system.
*/
void
sf_buf_free(void *addr, void *args)
{
struct sf_buf *sf;
struct vm_page *m;
sf = args;
pmap_qremove((vm_offset_t)addr, 1);
m = sf->m;
vm_page_lock_queues();
vm_page_unwire(m, 0);
/*
* Check for the object going away on us. This can
* happen since we don't hold a reference to it.
* If so, we're responsible for freeing the page.
*/
if (m->wire_count == 0 && m->object == NULL)
vm_page_free(m);
vm_page_unlock_queues();
sf->m = NULL;
mtx_lock(&sf_freelist.sf_lock);
SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list);
if (sf_buf_alloc_want > 0)
wakeup_one(&sf_freelist);
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Software interrupt handler for queued VM system processing.
*/

101
sys/powerpc/powerpc/vm_machdep.c
View File

@ -81,6 +81,8 @@
#include <sys/vnode.h>
#include <sys/vmmeter.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/unistd.h>
@ -101,6 +103,20 @@
#include <sys/user.h>
static void sf_buf_init(void *arg);
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL)
/*
* Expanded sf_freelist head. Really an SLIST_HEAD() in disguise, with the
* sf_freelist head with the sf_lock mutex.
*/
static struct {
SLIST_HEAD(, sf_buf) sf_head;
struct mtx sf_lock;
} sf_freelist;
static u_int sf_buf_alloc_want;
/*
* Finish a fork operation, with process p2 nearly set up.
* Copy and update the pcb, set up the stack so that the child
@ -219,6 +235,91 @@ cpu_reset()
OF_exit();
}
/*
* Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
*/
static void
sf_buf_init(void *arg)
{
struct sf_buf *sf_bufs;
vm_offset_t sf_base;
int i;
mtx_init(&sf_freelist.sf_lock, "sf_bufs list lock", NULL, MTX_DEF);
mtx_lock(&sf_freelist.sf_lock);
SLIST_INIT(&sf_freelist.sf_head);
sf_base = kmem_alloc_nofault(kernel_map, nsfbufs * PAGE_SIZE);
sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP,
M_NOWAIT | M_ZERO);
for (i = 0; i < nsfbufs; i++) {
sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
SLIST_INSERT_HEAD(&sf_freelist.sf_head, &sf_bufs[i], free_list);
}
sf_buf_alloc_want = 0;
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Get an sf_buf from the freelist. Will block if none are available.
*/
struct sf_buf *
sf_buf_alloc(struct vm_page *m)
{
struct sf_buf *sf;
int error;
mtx_lock(&sf_freelist.sf_lock);
while ((sf = SLIST_FIRST(&sf_freelist.sf_head)) == NULL) {
sf_buf_alloc_want++;
error = msleep(&sf_freelist, &sf_freelist.sf_lock, PVM|PCATCH,
"sfbufa", 0);
sf_buf_alloc_want--;
/*
* If we got a signal, don't risk going back to sleep.
*/
if (error)
break;
}
if (sf != NULL) {
SLIST_REMOVE_HEAD(&sf_freelist.sf_head, free_list);
sf->m = m;
pmap_qenter(sf->kva, &sf->m, 1);
}
mtx_unlock(&sf_freelist.sf_lock);
return (sf);
}
/*
* Detatch mapped page and release resources back to the system.
*/
void
sf_buf_free(void *addr, void *args)
{
struct sf_buf *sf;
struct vm_page *m;
sf = args;
pmap_qremove((vm_offset_t)addr, 1);
m = sf->m;
vm_page_lock_queues();
vm_page_unwire(m, 0);
/*
* Check for the object going away on us. This can
* happen since we don't hold a reference to it.
* If so, we're responsible for freeing the page.
*/
if (m->wire_count == 0 && m->object == NULL)
vm_page_free(m);
vm_page_unlock_queues();
sf->m = NULL;
mtx_lock(&sf_freelist.sf_lock);
SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list);
if (sf_buf_alloc_want > 0)
wakeup_one(&sf_freelist);
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Software interrupt handler for queued VM system processing.
*/

104
sys/sparc64/sparc64/vm_machdep.c
View File

@ -52,7 +52,11 @@
#include <sys/proc.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/kernel.h>
#include <sys/linker_set.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/unistd.h>
#include <sys/user.h>
@ -63,6 +67,7 @@
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/pmap.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>
#include <vm/vm_page.h>
#include <vm/vm_pageout.h>
@ -81,6 +86,20 @@
#include <machine/tlb.h>
#include <machine/tstate.h>
static void sf_buf_init(void *arg);
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL)
/*
* Expanded sf_freelist head. Really an SLIST_HEAD() in disguise, with the
* sf_freelist head with the sf_lock mutex.
*/
static struct {
SLIST_HEAD(, sf_buf) sf_head;
struct mtx sf_lock;
} sf_freelist;
static u_int sf_buf_alloc_want;
PMAP_STATS_VAR(uma_nsmall_alloc);
PMAP_STATS_VAR(uma_nsmall_alloc_oc);
PMAP_STATS_VAR(uma_nsmall_free);
@ -330,6 +349,91 @@ is_physical_memory(vm_paddr_t addr)
return (0);
}
/*
* Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
*/
static void
sf_buf_init(void *arg)
{
struct sf_buf *sf_bufs;
vm_offset_t sf_base;
int i;
mtx_init(&sf_freelist.sf_lock, "sf_bufs list lock", NULL, MTX_DEF);
mtx_lock(&sf_freelist.sf_lock);
SLIST_INIT(&sf_freelist.sf_head);
sf_base = kmem_alloc_nofault(kernel_map, nsfbufs * PAGE_SIZE);
sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP,
M_NOWAIT | M_ZERO);
for (i = 0; i < nsfbufs; i++) {
sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
SLIST_INSERT_HEAD(&sf_freelist.sf_head, &sf_bufs[i], free_list);
}
sf_buf_alloc_want = 0;
mtx_unlock(&sf_freelist.sf_lock);
}
/*
* Get an sf_buf from the freelist. Will block if none are available.
*/
struct sf_buf *
sf_buf_alloc(struct vm_page *m)
{
struct sf_buf *sf;
int error;
mtx_lock(&sf_freelist.sf_lock);
while ((sf = SLIST_FIRST(&sf_freelist.sf_head)) == NULL) {
sf_buf_alloc_want++;
error = msleep(&sf_freelist, &sf_freelist.sf_lock, PVM|PCATCH,
"sfbufa", 0);
sf_buf_alloc_want--;
/*
* If we got a signal, don't risk going back to sleep.
*/
if (error)
break;
}
if (sf != NULL) {
SLIST_REMOVE_HEAD(&sf_freelist.sf_head, free_list);
sf->m = m;
pmap_qenter(sf->kva, &sf->m, 1);
}
mtx_unlock(&sf_freelist.sf_lock);
return (sf);
}
/*
* Detatch mapped page and release resources back to the system.
*/
void
sf_buf_free(void *addr, void *args)
{
struct sf_buf *sf;
struct vm_page *m;
sf = args;
pmap_qremove((vm_offset_t)addr, 1);
m = sf->m;
vm_page_lock_queues();
vm_page_unwire(m, 0);
/*
* Check for the object going away on us. This can
* happen since we don't hold a reference to it.
* If so, we're responsible for freeing the page.
*/
if (m->wire_count == 0 && m->object == NULL)
vm_page_free(m);
vm_page_unlock_queues();
sf->m = NULL;
mtx_lock(&sf_freelist.sf_lock);
SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list);
if (sf_buf_alloc_want > 0)
wakeup_one(&sf_freelist);
mtx_unlock(&sf_freelist.sf_lock);
}
void
swi_vm(void *v)
{