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hugetlb: modular state for hugetlb page size

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The goal of this patchset is to support multiple hugetlb page sizes.  This
is achieved by introducing a new struct hstate structure, which
encapsulates the important hugetlb state and constants (eg.  huge page
size, number of huge pages currently allocated, etc).

The hstate structure is then passed around the code which requires these
fields, they will do the right thing regardless of the exact hstate they
are operating on.

This patch adds the hstate structure, with a single global instance of it
(default_hstate), and does the basic work of converting hugetlb to use the
hstate.

Future patches will add more hstate structures to allow for different
hugetlbfs mounts to have different page sizes.

[[email protected]: coding-style fixes]
Acked-by: Adam Litke <[email protected]>
Acked-by: Nishanth Aravamudan <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
Signed-off-by: Nick Piggin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andi Kleen 2008-07-23 21:27:41 -07:00 • committed by Linus Torvalds
commit a551643895
19 changed files with 356 additions and 218 deletions
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3
ipc/shm.c
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@ -577,7 +577,8 @@ static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
if (is_file_hugepages(shp->shm_file)) {
struct address_space *mapping = inode->i_mapping;
*rss += (HPAGE_SIZE/PAGE_SIZE)*mapping->nrpages;
struct hstate *h = hstate_file(shp->shm_file);
*rss += pages_per_huge_page(h) * mapping->nrpages;
} else {
struct shmem_inode_info *info = SHMEM_I(inode);
spin_lock(&info->lock);