242 lines
6.4 KiB
C
242 lines
6.4 KiB
C
/*-
|
|
* Copyright (c) 2014 Gleb Smirnoff <glebius@FreeBSD.org>
|
|
* Copyright (c) 2003, 2005 Alan L. Cox <alc@cs.rice.edu>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/sf_buf.h>
|
|
#include <sys/smp.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_extern.h>
|
|
#include <vm/vm_page.h>
|
|
|
|
#ifndef NSFBUFS
|
|
#define NSFBUFS (512 + maxusers * 16)
|
|
#endif
|
|
|
|
static int nsfbufs;
|
|
static int nsfbufspeak;
|
|
static int nsfbufsused;
|
|
|
|
SYSCTL_INT(_kern_ipc, OID_AUTO, nsfbufs, CTLFLAG_RDTUN, &nsfbufs, 0,
|
|
"Maximum number of sendfile(2) sf_bufs available");
|
|
SYSCTL_INT(_kern_ipc, OID_AUTO, nsfbufspeak, CTLFLAG_RD, &nsfbufspeak, 0,
|
|
"Number of sendfile(2) sf_bufs at peak usage");
|
|
SYSCTL_INT(_kern_ipc, OID_AUTO, nsfbufsused, CTLFLAG_RD, &nsfbufsused, 0,
|
|
"Number of sendfile(2) sf_bufs in use");
|
|
|
|
static void sf_buf_init(void *arg);
|
|
SYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL);
|
|
|
|
LIST_HEAD(sf_head, sf_buf);
|
|
|
|
/*
|
|
* A hash table of active sendfile(2) buffers
|
|
*/
|
|
static struct sf_head *sf_buf_active;
|
|
static u_long sf_buf_hashmask;
|
|
|
|
#define SF_BUF_HASH(m) (((m) - vm_page_array) & sf_buf_hashmask)
|
|
|
|
static TAILQ_HEAD(, sf_buf) sf_buf_freelist;
|
|
static u_int sf_buf_alloc_want;
|
|
|
|
/*
|
|
* A lock used to synchronize access to the hash table and free list
|
|
*/
|
|
static struct mtx sf_buf_lock;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
#ifdef SFBUF_OPTIONAL_DIRECT_MAP
|
|
if (SFBUF_OPTIONAL_DIRECT_MAP)
|
|
return;
|
|
#endif
|
|
|
|
nsfbufs = NSFBUFS;
|
|
TUNABLE_INT_FETCH("kern.ipc.nsfbufs", &nsfbufs);
|
|
|
|
sf_buf_active = hashinit(nsfbufs, M_TEMP, &sf_buf_hashmask);
|
|
TAILQ_INIT(&sf_buf_freelist);
|
|
sf_base = kva_alloc(nsfbufs * PAGE_SIZE);
|
|
sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP,
|
|
M_WAITOK | M_ZERO);
|
|
for (i = 0; i < nsfbufs; i++) {
|
|
sf_bufs[i].kva = sf_base + i * PAGE_SIZE;
|
|
TAILQ_INSERT_TAIL(&sf_buf_freelist, &sf_bufs[i], free_entry);
|
|
}
|
|
sf_buf_alloc_want = 0;
|
|
mtx_init(&sf_buf_lock, "sf_buf", NULL, MTX_DEF);
|
|
}
|
|
|
|
/*
|
|
* Get an sf_buf from the freelist. May block if none are available.
|
|
*/
|
|
struct sf_buf *
|
|
sf_buf_alloc(struct vm_page *m, int flags)
|
|
{
|
|
struct sf_head *hash_list;
|
|
struct sf_buf *sf;
|
|
int error;
|
|
|
|
#ifdef SFBUF_OPTIONAL_DIRECT_MAP
|
|
if (SFBUF_OPTIONAL_DIRECT_MAP)
|
|
return ((struct sf_buf *)m);
|
|
#endif
|
|
|
|
KASSERT(curthread->td_pinned > 0 || (flags & SFB_CPUPRIVATE) == 0,
|
|
("sf_buf_alloc(SFB_CPUPRIVATE): curthread not pinned"));
|
|
hash_list = &sf_buf_active[SF_BUF_HASH(m)];
|
|
mtx_lock(&sf_buf_lock);
|
|
LIST_FOREACH(sf, hash_list, list_entry) {
|
|
if (sf->m == m) {
|
|
sf->ref_count++;
|
|
if (sf->ref_count == 1) {
|
|
TAILQ_REMOVE(&sf_buf_freelist, sf, free_entry);
|
|
nsfbufsused++;
|
|
nsfbufspeak = imax(nsfbufspeak, nsfbufsused);
|
|
}
|
|
#if defined(SMP) && defined(SFBUF_CPUSET)
|
|
sf_buf_shootdown(sf, flags);
|
|
#endif
|
|
goto done;
|
|
}
|
|
}
|
|
while ((sf = TAILQ_FIRST(&sf_buf_freelist)) == NULL) {
|
|
if (flags & SFB_NOWAIT)
|
|
goto done;
|
|
sf_buf_alloc_want++;
|
|
SFSTAT_INC(sf_allocwait);
|
|
error = msleep(&sf_buf_freelist, &sf_buf_lock,
|
|
(flags & SFB_CATCH) ? PCATCH | PVM : PVM, "sfbufa", 0);
|
|
sf_buf_alloc_want--;
|
|
|
|
/*
|
|
* If we got a signal, don't risk going back to sleep.
|
|
*/
|
|
if (error)
|
|
goto done;
|
|
}
|
|
TAILQ_REMOVE(&sf_buf_freelist, sf, free_entry);
|
|
if (sf->m != NULL)
|
|
LIST_REMOVE(sf, list_entry);
|
|
LIST_INSERT_HEAD(hash_list, sf, list_entry);
|
|
sf->ref_count = 1;
|
|
sf->m = m;
|
|
nsfbufsused++;
|
|
nsfbufspeak = imax(nsfbufspeak, nsfbufsused);
|
|
sf_buf_map(sf, flags);
|
|
done:
|
|
mtx_unlock(&sf_buf_lock);
|
|
return (sf);
|
|
}
|
|
|
|
/*
|
|
* Remove a reference from the given sf_buf, adding it to the free
|
|
* list when its reference count reaches zero. A freed sf_buf still,
|
|
* however, retains its virtual-to-physical mapping until it is
|
|
* recycled or reactivated by sf_buf_alloc(9).
|
|
*/
|
|
void
|
|
sf_buf_free(struct sf_buf *sf)
|
|
{
|
|
|
|
#ifdef SFBUF_OPTIONAL_DIRECT_MAP
|
|
if (SFBUF_OPTIONAL_DIRECT_MAP)
|
|
return;
|
|
#endif
|
|
|
|
mtx_lock(&sf_buf_lock);
|
|
sf->ref_count--;
|
|
if (sf->ref_count == 0) {
|
|
TAILQ_INSERT_TAIL(&sf_buf_freelist, sf, free_entry);
|
|
nsfbufsused--;
|
|
if (sf_buf_unmap(sf)) {
|
|
sf->m = NULL;
|
|
LIST_REMOVE(sf, list_entry);
|
|
}
|
|
if (sf_buf_alloc_want > 0)
|
|
wakeup(&sf_buf_freelist);
|
|
}
|
|
mtx_unlock(&sf_buf_lock);
|
|
}
|
|
|
|
void
|
|
sf_buf_ref(struct sf_buf *sf)
|
|
{
|
|
|
|
#ifdef SFBUF_OPTIONAL_DIRECT_MAP
|
|
if (SFBUF_OPTIONAL_DIRECT_MAP)
|
|
return;
|
|
#endif
|
|
|
|
mtx_lock(&sf_buf_lock);
|
|
KASSERT(sf->ref_count > 0, ("%s: sf %p not allocated", __func__, sf));
|
|
sf->ref_count++;
|
|
mtx_unlock(&sf_buf_lock);
|
|
}
|
|
|
|
#ifdef SFBUF_PROCESS_PAGE
|
|
/*
|
|
* Run callback function on sf_buf that holds a certain page.
|
|
*/
|
|
boolean_t
|
|
sf_buf_process_page(vm_page_t m, void (*cb)(struct sf_buf *))
|
|
{
|
|
struct sf_head *hash_list;
|
|
struct sf_buf *sf;
|
|
|
|
hash_list = &sf_buf_active[SF_BUF_HASH(m)];
|
|
mtx_lock(&sf_buf_lock);
|
|
LIST_FOREACH(sf, hash_list, list_entry) {
|
|
if (sf->m == m) {
|
|
cb(sf);
|
|
mtx_unlock(&sf_buf_lock);
|
|
return (TRUE);
|
|
}
|
|
}
|
|
mtx_unlock(&sf_buf_lock);
|
|
return (FALSE);
|
|
}
|
|
#endif /* SFBUF_PROCESS_PAGE */
|