[PATCH 5/9] vmap: add flag to allow lazy unmap to be disabled at runtime
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From: Konrad Rzeszutek Wilk on 27 Jul 2010 13:30 From: Jeremy Fitzhardinge <jeremy.fitzhardinge(a)citrix.com> 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(a)citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk(a)oracle.com> Acked-by: Nick Piggin <npiggin(a)suse.de> --- include/linux/vmalloc.h | 2 ++ mm/vmalloc.c | 4 ++++ 2 files changed, 6 insertions(+), 0 deletions(-) diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 227c2a5..b840fda 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 ae00746..7f35fe2 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); -- 1.7.0.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |