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implementing demand paging to make it possible to run Intel OpenMP programs

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This commit is contained in:
Masamichi Takagi m-takagi@ab.jp.nec.com
2013-07-02 21:31:38 +09:00
parent 75b51ec0c1
commit b59be07e9a
4 changed files with 79 additions and 10 deletions
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24
kernel/syscall.c
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@@ -274,7 +274,21 @@ SYSCALL_DECLARE(mmap)
unsigned long s = (region->map_end + PAGE_SIZE - 1) & PAGE_MASK;
unsigned long map_end_aligned = region->map_end;
unsigned long len = (ihk_mc_syscall_arg1(ctx) + PAGE_SIZE - 1) & PAGE_MASK;
dkprintf("syscall.c,mmap,len=%lx", len);
dkprintf("syscall.c,mmap,len=%lx\n", len);
unsigned long flag = 0; /* eager paging */
#if 1
/* Intel OpenMP hack: it requests 128MB and munmap tail and head
to create 64MB-aligned 64MB memory area
and then it tries to touch memory-block
with offset of 0x10, 0x101008 */
if(ihk_mc_syscall_arg1(ctx) == 1024*1024*64 || ihk_mc_syscall_arg1(ctx) == 1024*1024*128) {
flag |= VR_DEMAND_PAGING; /* demand paging */
kprintf("SC(%d)[mmap],!MAP_FIXED,MAP_ANONYMOUS,sz=%lx\n", ihk_mc_get_processor_id(), ihk_mc_syscall_arg1(ctx));
}
//if(ihk_mc_syscall_arg3(ctx) & 0x100) { flag |= 0x1000; };
#endif
#ifdef USE_NOCACHE_MMAP
if ((ihk_mc_syscall_arg3(ctx) & 0x40) == 0x40) {
@@ -290,11 +304,15 @@ SYSCALL_DECLARE(mmap)
extend_process_region(cpu_local_var(current),
region->map_start,
map_end_aligned,
s + len, 0);
s + len, flag);
}
if(ihk_mc_syscall_arg1(ctx) == 1024*1024*64 || ihk_mc_syscall_arg1(ctx) == 1024*1024*128) {
kprintf("syscall.c,mmap,cpuid=%d,map_end-len=%lx,s+len=%lx,map_end=%lx\n", ihk_mc_get_processor_id(), region->map_end-len, s+len, region->map_end);
}
ihk_mc_spinlock_unlock_noirq(&cpu_local_var(current)->vm->memory_range_lock);
dkprintf("syscall.c,mmap,map_end=%lx,s+len=%lx\n", region->map_end, s+len);
#ifdef USE_LARGE_PAGES
if (region->map_end >= s + len) {
/* NOTE: extend_process_region() might have large page aligned */