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disable demand paging on ANONYMOUS mappings unless anon_on_demand kernel argument is passed

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This commit is contained in:
Balazs Gerofi
2015-09-14 17:26:37 +09:00
parent 69f4b0e1ad
commit e1a01803d0
3 changed files with 12 additions and 1 deletions
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2
kernel/include/page.h
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@@ -66,4 +66,6 @@ static inline int page_is_multi_mapped(struct page *page)
return (ihk_atomic_read(&page->count) > 1); return (ihk_atomic_read(&page->count) > 1);
} }
/* Should we take page faults on ANONYMOUS mappings? */
extern int anon_on_demand;
#endif #endif

7
kernel/mem.c
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@@ -56,6 +56,8 @@ extern int ihk_mc_pt_print_pte(struct page_table *pt, void *virt);
struct tlb_flush_entry tlb_flush_vector[IHK_TLB_FLUSH_IRQ_VECTOR_SIZE]; struct tlb_flush_entry tlb_flush_vector[IHK_TLB_FLUSH_IRQ_VECTOR_SIZE];
int anon_on_demand = 0;
static void reserve_pages(unsigned long start, unsigned long end, int type) static void reserve_pages(unsigned long start, unsigned long end, int type)
{ {
if (start < pa_start) { if (start < pa_start) {
@@ -681,6 +683,11 @@ void mem_init(void)
/* Prepare the kernel virtual map space */ /* Prepare the kernel virtual map space */
virtual_allocator_init(); virtual_allocator_init();
if (find_command_line("anon_on_demand")) {
kprintf("Demand paging on ANONYMOUS mappings enabled.\n");
anon_on_demand = 1;
}
} }
struct location { struct location {

4
kernel/syscall.c
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@@ -1078,7 +1078,9 @@ SYSCALL_DECLARE(mmap)
} }
#endif #endif
else { else {
vrflags |= VR_DEMAND_PAGING; if (anon_on_demand) {
vrflags |= VR_DEMAND_PAGING;
}
} }
} }
else { else {