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Flushing pages to vfs will work, but the issue is that while vfs is

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serving mm0, if it page faults, system deadlocks because mm0 is waiting to be served by vfs.

FIX: To fix this, mm0 will need to fork itself and keep a separate thread solely for
page fault handling.
This commit is contained in:
Bahadir Balban
2008-05-28 23:37:41 +03:00
parent 98888a94b5
commit f561d885d5
6 changed files with 39 additions and 9 deletions
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6
tasks/mm0/src/pagers.c
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@@ -84,9 +84,15 @@ int file_page_out(struct vm_object *vm_obj, unsigned long page_offset)
if (!(page->flags & VM_DIRTY))
return 0;
paddr = (void *)page_to_phys(page);
vaddr = phys_to_virt(paddr);
/* Map the page to vfs task */
l4_map(paddr, vaddr, 1, MAP_USR_RW_FLAGS, VFS_TID);
printf("%s/%s: Writing to vnode %d, at pgoff 0x%x, %d pages, buf at 0x%x\n",
__TASKNAME__, __FUNCTION__, vm_file_to_vnum(f), page_offset, 1, vaddr);
/* Syscall to vfs to write page back to file. */
if ((err = vfs_write(vm_file_to_vnum(f), page_offset, 1, vaddr)) < 0)
goto out_err;