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Pre-map file mappings from /dev/shm (--mpol-shm-premap mcexec argument)

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This commit is contained in:
Balazs Gerofi
2017-03-12 14:34:34 +09:00
parent c5079898c2
commit 9b5ccb5a33
8 changed files with 157 additions and 7 deletions
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30
kernel/syscall.c
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@@ -1321,6 +1321,36 @@ do_mmap(const intptr_t addr0, const size_t len0, const int prot,
populate_len = memobj->size;
}
memobj_unlock(memobj);
/* Update PTEs for pre-mapped memory object */
if ((memobj->flags & MF_PREMAP) &&
(proc->mpol_flags & MPOL_SHM_PREMAP)) {
int i;
enum ihk_mc_pt_attribute ptattr;
ptattr = arch_vrflag_to_ptattr(range->flag, PF_POPULATE, NULL);
for (i = 0; i < memobj->nr_pages; ++i) {
error = ihk_mc_pt_set_range(proc->vm->address_space->page_table,
proc->vm,
(void *)range->start + (i * PAGE_SIZE),
(void *)range->start + (i * PAGE_SIZE) +
PAGE_SIZE,
virt_to_phys(memobj->pages[i]),
ptattr,
PAGE_SHIFT);
if (error) {
kprintf("%s: ERROR: mapping %d page of pre-mapped file\n",
__FUNCTION__, i);
}
}
dkprintf("%s: memobj 0x%lx pre-mapped\n", __FUNCTION__, memobj);
}
/*
else if (memobj->flags & MF_REG_FILE) {
populated_mapping = 1;
populate_len = memobj->size;
}
*/
}
error = 0;