diff options
| author |   provos <provos@openbsd.org> | 2000-02-28 18:04:08 +0000 |
|---|---|---|
| committer | provos <provos@openbsd.org> | 2000-02-28 18:04:08 +0000 |
| commit | 4139c9c84e45b9c8064979c23c3cd7cd3e0349d1 (patch) | |
| tree | 25fccac5110154aedf92aee27048be85759ac2d4 /sys/sys/filedesc.h | |
| parent | add ip6defaultif, which configures default outgoing interface (diff) | |
| download | wireguard-openbsd-4139c9c84e45b9c8064979c23c3cd7cd3e0349d1.tar.xz wireguard-openbsd-4139c9c84e45b9c8064979c23c3cd7cd3e0349d1.zip | |
Optimized fdalloc as in Banga and Mogul paper:
http://www.usenix.org/publications/library/proceedings/usenix98/banga.html
Diffstat (limited to 'sys/sys/filedesc.h')
| -rw-r--r-- | sys/sys/filedesc.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/sys/sys/filedesc.h b/sys/sys/filedesc.h index 60826702402..ce56b6206cb 100644 --- a/sys/sys/filedesc.h +++ b/sys/sys/filedesc.h @@ -1,4 +1,4 @@ -/* $OpenBSD: filedesc.h,v 1.6 1999/07/13 15:17:52 provos Exp $ */ +/* $OpenBSD: filedesc.h,v 1.7 2000/02/28 18:04:09 provos Exp $ */ /* $NetBSD: filedesc.h,v 1.14 1996/04/09 20:55:28 cgd Exp $ */ /* @@ -52,6 +52,11 @@ */ #define NDFILE 20 #define NDEXTENT 50 /* 250 bytes in 256-byte alloc. */ +#define NDENTRIES 32 /* 32 fds per entry */ +#define NDENTRYMASK (NDENTRIES - 1) +#define NDENTRYSHIFT 5 /* bits per entry */ +#define NDLOSLOTS(x) (((x) + NDENTRIES - 1) >> NDENTRYSHIFT) +#define NDHISLOTS(x) ((NDLOSLOTS(x) + NDENTRIES - 1) >> NDENTRYSHIFT) struct filedesc { struct file **fd_ofiles; /* file structures for open files */ @@ -59,6 +64,8 @@ struct filedesc { struct vnode *fd_cdir; /* current directory */ struct vnode *fd_rdir; /* root directory */ int fd_nfiles; /* number of open files allocated */ + u_int *fd_himap; /* each bit points to 32 fds */ + u_int *fd_lomap; /* bitmap of free fds */ int fd_lastfile; /* high-water mark of fd_ofiles */ int fd_freefile; /* approx. next free file */ u_short fd_cmask; /* mask for file creation */ @@ -77,6 +84,12 @@ struct filedesc0 { */ struct file *fd_dfiles[NDFILE]; char fd_dfileflags[NDFILE]; + /* + * There arrays are used when the number of open files is + * <= 1024, and are then pointed to by the pointers above. + */ + u_int fd_dhimap[NDENTRIES >> NDENTRYSHIFT]; + u_int fd_dlomap[NDENTRIES]; }; /* |