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Use MAP_NOSYNC for vnodes without any links in their filesystem.

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This is necessary for vmware: it does not use an anonymous mmap for
the memory of the virtual system. In stead it creates a temp file an
unlinks it. For a 50 MB file, this results in a ot of syncing
every 30 seconds.

Reviewed by:	Matthew Dillon <dillon@backplane.com>
This commit is contained in:
Guido van Rooij 2000-01-03 19:13:53 +00:00
parent 0f9183be1b
commit 00d76afede
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=55351
1 changed files with 7 additions and 0 deletions
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7
sys/vm/vm_mmap.c
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@ -1024,6 +1024,13 @@ vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
return (error);
objsize = round_page(vat.va_size);
type = OBJT_VNODE;
/*
* if it is a regular file without any references
* we do not need to sync it.
*/
if (vp->v_type == VREG && vat.va_nlink == 0) {
flags |= MAP_NOSYNC;
}
}
}