32#include <sys/kernel.h>
34#include <sys/malloc.h>
37#include <sys/sf_buf.h>
39#include <sys/sysctl.h>
42#include <vm/vm_extern.h>
43#include <vm/vm_page.h>
46#define NSFBUFS (512 + maxusers * 16)
54 "Maximum number of sendfile(2) sf_bufs available");
56 "Number of sendfile(2) sf_bufs at peak usage");
58 "Number of sendfile(2) sf_bufs in use");
71#define SF_BUF_HASH(m) (((m) - vm_page_array) & sf_buf_hashmask)
74static u_int sf_buf_alloc_want;
79static struct mtx sf_buf_lock;
87 struct sf_buf *sf_bufs;
95 TUNABLE_INT_FETCH(
"kern.ipc.nsfbufs", &
nsfbufs);
98 TAILQ_INIT(&sf_buf_freelist);
99 sf_base = kva_alloc(
nsfbufs * PAGE_SIZE);
102 for (i = 0; i <
nsfbufs; i++) {
103 sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
104 TAILQ_INSERT_TAIL(&sf_buf_freelist, &sf_bufs[i], free_entry);
106 sf_buf_alloc_want = 0;
107 mtx_init(&sf_buf_lock,
"sf_buf", NULL, MTX_DEF);
116 struct sf_head *hash_list;
121 return ((
struct sf_buf *)m);
123 KASSERT(curthread->td_pinned > 0 || (
flags & SFB_CPUPRIVATE) == 0,
124 (
"sf_buf_alloc(SFB_CPUPRIVATE): curthread not pinned"));
126 mtx_lock(&sf_buf_lock);
127 LIST_FOREACH(sf, hash_list, list_entry) {
130 if (sf->ref_count == 1) {
131 TAILQ_REMOVE(&sf_buf_freelist, sf, free_entry);
135#if defined(SMP) && defined(SFBUF_CPUSET)
136 sf_buf_shootdown(sf,
flags);
141 while ((sf = TAILQ_FIRST(&sf_buf_freelist)) == NULL) {
142 if (
flags & SFB_NOWAIT)
145 SFSTAT_INC(sf_allocwait);
146 error = msleep(&sf_buf_freelist, &sf_buf_lock,
147 (
flags & SFB_CATCH) ? PCATCH | PVM : PVM,
"sfbufa", 0);
156 TAILQ_REMOVE(&sf_buf_freelist, sf, free_entry);
158 LIST_REMOVE(sf, list_entry);
159 LIST_INSERT_HEAD(hash_list, sf, list_entry);
164 sf_buf_map(sf,
flags);
166 mtx_unlock(&sf_buf_lock);
183 mtx_lock(&sf_buf_lock);
185 if (sf->ref_count == 0) {
186 TAILQ_INSERT_TAIL(&sf_buf_freelist, sf, free_entry);
188 if (sf_buf_unmap(sf)) {
190 LIST_REMOVE(sf, list_entry);
192 if (sf_buf_alloc_want > 0)
195 mtx_unlock(&sf_buf_lock);
205 mtx_lock(&sf_buf_lock);
206 KASSERT(sf->ref_count > 0, (
"%s: sf %p not allocated", __func__, sf));
208 mtx_unlock(&sf_buf_lock);
211#ifdef SFBUF_PROCESS_PAGE
216sf_buf_process_page(vm_page_t m,
void (*cb)(
struct sf_buf *))
218 struct sf_head *hash_list;
222 mtx_lock(&sf_buf_lock);
223 LIST_FOREACH(sf, hash_list, list_entry) {
226 mtx_unlock(&sf_buf_lock);
230 mtx_unlock(&sf_buf_lock);
void *() malloc(size_t size, struct malloc_type *mtp, int flags)
void wakeup(const void *ident)
void * hashinit(int elements, struct malloc_type *type, u_long *hashmask)
LIST_HEAD(sf_head, sf_buf)
static u_long sf_buf_hashmask
struct sf_buf * sf_buf_alloc(struct vm_page *m, int flags)
void sf_buf_free(struct sf_buf *sf)
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL)
SYSCTL_INT(_kern_ipc, OID_AUTO, nsfbufs, CTLFLAG_RDTUN, &nsfbufs, 0, "Maximum number of sendfile(2) sf_bufs available")
static TAILQ_HEAD(sf_buf)
static struct sf_head * sf_buf_active
void sf_buf_ref(struct sf_buf *sf)
static void sf_buf_init(void *arg)