diff options
| author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-03-26 15:28:51 -0700 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2010-07-27 11:49:09 -0400 |
| commit | a0d40c80256e31b23849f2ba781b74bf0218a1fa (patch) | |
| tree | f89ad006e486c021d95db3f37763558556d731e1 | |
| parent | 08bbc9da92f7e44b9c208c6a1adba70c403b255e (diff) | |
vmap: add flag to allow lazy unmap to be disabled at runtime
Add a flag to force lazy_max_pages() to zero to prevent any outstanding
mapped pages. We'll need this for Xen.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Nick Piggin <npiggin@suse.de>
| -rw-r--r-- | include/linux/vmalloc.h | 2 | ||||
| -rw-r--r-- | mm/vmalloc.c | 4 |
2 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 227c2a585e4f..b840fdaf438c 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -7,6 +7,8 @@ struct vm_area_struct; /* vma defining user mapping in mm_types.h */ +extern bool vmap_lazy_unmap; + /* bits in flags of vmalloc's vm_struct below */ #define VM_IOREMAP 0x00000001 /* ioremap() and friends */ #define VM_ALLOC 0x00000002 /* vmalloc() */ diff --git a/mm/vmalloc.c b/mm/vmalloc.c index ae007462b7f6..7f35fe2cf9e7 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -31,6 +31,7 @@ #include <asm/tlbflush.h> #include <asm/shmparam.h> +bool vmap_lazy_unmap __read_mostly = true; /*** Page table manipulation functions ***/ @@ -502,6 +503,9 @@ static unsigned long lazy_max_pages(void) { unsigned int log; + if (!vmap_lazy_unmap) + return 0; + log = fls(num_online_cpus()); return log * (32UL * 1024 * 1024 / PAGE_SIZE); |