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support madvise(MADV_REMOVE) partially

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This MADV_REMOVE works with a mapping which is
- created with shmat() and
- not sharing memobj with other mappings.
This commit is contained in:
NAKAMURA Gou
2015-10-28 18:40:18 +09:00
parent c25f8c7a39
commit 0b07dd1b79
3 changed files with 71 additions and 5 deletions
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31
kernel/shmobj.c
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@@ -33,11 +33,13 @@ static ihk_spinlock_t shmobj_list_lock_body = SPIN_LOCK_UNLOCKED;
static memobj_release_func_t shmobj_release;
static memobj_ref_func_t shmobj_ref;
static memobj_get_page_func_t shmobj_get_page;
static memobj_invalidate_page_func_t shmobj_invalidate_page;
static struct memobj_ops shmobj_ops = {
.release = &shmobj_release,
.ref = &shmobj_ref,
.get_page = &shmobj_get_page,
.invalidate_page = &shmobj_invalidate_page,
};
static struct shmobj *to_shmobj(struct memobj *memobj)
@@ -158,7 +160,7 @@ int shmobj_create_indexed(struct shmid_ds *ds, struct shmobj **objp)
error = shmobj_create(ds, &obj);
if (!error) {
obj->flags |= MF_SHMDT_OK;
obj->flags |= MF_SHMDT_OK | MF_IS_REMOVABLE;
*objp = to_shmobj(obj);
}
return error;
@@ -369,3 +371,30 @@ out:
memobj, off, p2align, physp, error);
return error;
}
static int shmobj_invalidate_page(struct memobj *memobj, uintptr_t phys,
size_t pgsize)
{
struct shmobj *obj = to_shmobj(memobj);
int error;
struct page *page;
dkprintf("shmobj_invalidate_page(%p,%#lx,%#lx)\n", memobj, phys, pgsize);
if (!(page = phys_to_page(phys))
|| !(page = page_list_lookup(obj, page->offset))) {
error = 0;
goto out;
}
if (ihk_atomic_read(&page->count) == 1) {
if (page_unmap(page)) {
ihk_mc_free_pages(phys_to_virt(phys), pgsize/PAGE_SIZE);
}
}
error = 0;
out:
dkprintf("shmobj_invalidate_page(%p,%#lx,%#lx):%d\n", memobj, phys, pgsize, error);
return error;
}