subr_sfbuf.c File Reference

#include <sys/cdefs.h>
#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>

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Macros
#define	NSFBUFS   (512 + maxusers * 16)
#define	SF_BUF_HASH(m)   (((m) - vm_page_array) & sf_buf_hashmask)

Functions
	__FBSDID ("$FreeBSD$")
	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)
static	TAILQ_HEAD (sf_buf)
struct sf_buf *	sf_buf_alloc (struct vm_page *m, int flags)
void	sf_buf_free (struct sf_buf *sf)
void	sf_buf_ref (struct sf_buf *sf)

Variables
static int	nsfbufs
static int	nsfbufspeak
static int	nsfbufsused
static struct sf_head *	sf_buf_active
static u_long	sf_buf_hashmask

Macro Definition Documentation

NSFBUFS

#define NSFBUFS   (512 + maxusers * 16)

Definition at line 46 of file subr_sfbuf.c.

SF_BUF_HASH

#define SF_BUF_HASH

(

m

)

(((m) - vm_page_array) & sf_buf_hashmask)

Definition at line 71 of file subr_sfbuf.c.

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

LIST_HEAD()

LIST_HEAD	(	sf_head	,
		sf_buf
	)

sf_buf_alloc()

struct sf_buf * sf_buf_alloc	(	struct vm_page *	m,
		int	flags
	)

Definition at line 114 of file subr_sfbuf.c.

References flags, nsfbufspeak, nsfbufsused, sf_buf_active, and SF_BUF_HASH.

Referenced by _mb_unmapped_to_ext(), exec_map_first_page(), and vn_sendfile().

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sf_buf_free()

void sf_buf_free

(

struct sf_buf *

sf

)

Definition at line 177 of file subr_sfbuf.c.

References nsfbufsused, and wakeup().

Referenced by exec_unmap_first_page(), mb_unmapped_free_mext(), and sendfile_free_mext().

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sf_buf_init()

static void sf_buf_init ( void *  arg )

static

sf_buf_ref()

void sf_buf_ref

(

struct sf_buf *

sf

)

Definition at line 199 of file subr_sfbuf.c.

SYSCTL_INT() [1/3]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		nsfbufs	,
		CTLFLAG_RDTUN	,
		&	nsfbufs,
		0	,
		"Maximum number of sendfile(2) sf_bufs available"
	)

SYSCTL_INT() [2/3]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		nsfbufspeak	,
		CTLFLAG_RD	,
		&	nsfbufspeak,
		0	,
		"Number of sendfile(2) sf_bufs at peak usage"
	)

SYSCTL_INT() [3/3]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		nsfbufsused	,
		CTLFLAG_RD	,
		&	nsfbufsused,
		0	,
		"Number of sendfile(2) sf_bufs in use"
	)

SYSINIT()

SYSINIT	(	sock_sf	,
		SI_SUB_MBUF	,
		SI_ORDER_ANY	,
		sf_buf_init	,
		NULL
	)

TAILQ_HEAD()

static TAILQ_HEAD ( sf_buf  )

static

Definition at line 73 of file subr_sfbuf.c.

Variable Documentation

nsfbufs

int nsfbufs

static

Definition at line 49 of file subr_sfbuf.c.

nsfbufspeak

int nsfbufspeak

static

Definition at line 50 of file subr_sfbuf.c.

Referenced by sf_buf_alloc().

nsfbufsused

int nsfbufsused

static

Definition at line 51 of file subr_sfbuf.c.

Referenced by sf_buf_alloc(), and sf_buf_free().

sf_buf_active

struct sf_head* sf_buf_active

static

Definition at line 68 of file subr_sfbuf.c.

Referenced by sf_buf_alloc().

sf_buf_hashmask

u_long sf_buf_hashmask

static

Definition at line 69 of file subr_sfbuf.c.