diff options
| author | dyson <dyson@FreeBSD.org> | 1996-07-14 06:05:53 +0000 |
|---|---|---|
| committer | dyson <dyson@FreeBSD.org> | 1996-07-14 06:05:53 +0000 |
| commit | f8e0a40f1c864d1f5f3680164336b038f79272c8 (patch) | |
| tree | 89c83bf18ca0b97d26cb680c6a448f748e2a57b9 /sys/amd64 | |
| parent | 0a66b4f53af262b5e10fac0f9ba77c6f7bb1ff12 (diff) | |
| download | FreeBSD-src-f8e0a40f1c864d1f5f3680164336b038f79272c8.zip FreeBSD-src-f8e0a40f1c864d1f5f3680164336b038f79272c8.tar.gz | |
Almost gratuitious improvement of the performance of reading
/dev/zero.
Diffstat (limited to 'sys/amd64')
| -rw-r--r-- | sys/amd64/amd64/mem.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/sys/amd64/amd64/mem.c b/sys/amd64/amd64/mem.c index 09ab5bf..147a13d 100644 --- a/sys/amd64/amd64/mem.c +++ b/sys/amd64/amd64/mem.c @@ -38,7 +38,7 @@ * * from: Utah $Hdr: mem.c 1.13 89/10/08$ * from: @(#)mem.c 7.2 (Berkeley) 5/9/91 - * $Id: mem.c,v 1.33 1996/04/07 14:59:26 bde Exp $ + * $Id: mem.c,v 1.34 1996/05/02 10:43:05 phk Exp $ */ /* @@ -99,6 +99,7 @@ static void *io_devfs_token; static void *perfmon_devfs_token; #endif + static void memdevfs_init __P((void)); static void @@ -134,6 +135,7 @@ memdevfs_init() #endif /* DEVFS */ extern char *ptvmmap; /* poor name! */ +caddr_t zbuf; static int mmclose(dev, flags, fmt, p) @@ -153,6 +155,12 @@ mmclose(dev, flags, fmt, p) fp = (struct trapframe *)curproc->p_md.md_regs; fp->tf_eflags &= ~PSL_IOPL; break; + + case 12: + if (zbuf) { + free(zbuf, M_TEMP); + zbuf = NULL; + } default: break; } @@ -179,6 +187,7 @@ mmopen(dev, flags, fmt, p) fp = (struct trapframe *)curproc->p_md.md_regs; fp->tf_eflags |= PSL_IOPL; break; + default: break; } @@ -294,13 +303,13 @@ mmrw(dev, uio, flags) c = iov->iov_len; break; } - if (buf == NULL) { - buf = (caddr_t) + if (zbuf == NULL) { + zbuf = (caddr_t) malloc(PAGE_SIZE, M_TEMP, M_WAITOK); - bzero(buf, PAGE_SIZE); + bzero(zbuf, PAGE_SIZE); } c = min(iov->iov_len, PAGE_SIZE); - error = uiomove(buf, (int)c, uio); + error = uiomove(zbuf, (int)c, uio); continue; #ifdef notyet |
