On Mon, 16 Mar 2015 16:53:27 -0700 Mike Kravetz <[email protected]> wrote:
> The same routines that perform subpool maximum size accounting
> hugepage_subpool_get/put_pages() are modified to also perform
> minimum size accounting. When a delta value is passed to these
> routines, calculate how global reservations must be adjusted
> to maintain the subpool minimum size. The routines now return
> this global reserve count adjustment. This global adjusted
> reserve count is then passed to the global accounting routine
> hugetlb_acct_memory().
>
The comment layout is a bit chaotic. Also, sentences start with
capital letters and end with little round things! It's a bit
anal but heck, the kernel isn't written in linglish.
--- a/mm/hugetlb.c~hugetlbfs-add-minimum-size-accounting-to-subpools-fix
+++ a/mm/hugetlb.c
@@ -125,8 +125,10 @@ static long hugepage_subpool_get_pages(s
if (spool->min_hpages) { /* minimum size accounting */
if (delta > spool->rsv_hpages) {
- /* asking for more reserves than those already taken
- * on behalf of subpool. return difference */
+ /*
+ * Asking for more reserves than those already taken on
+ * behalf of subpool. Return difference.
+ */
ret = delta - spool->rsv_hpages;
spool->rsv_hpages = 0;
} else {
@@ -141,7 +143,7 @@ unlock_ret:
}
/*
- * subpool accounting for freeing and unreserving pages
+ * Subpool accounting for freeing and unreserving pages.
* Return the number of global page reservations that must be dropped.
* The return value may only be different than the passed value (delta)
* in the case where a subpool minimum size must be maintained.
@@ -170,8 +172,10 @@ static long hugepage_subpool_put_pages(s
spool->rsv_hpages = spool->min_hpages;
}
- /* If hugetlbfs_put_super couldn't free spool due to
- * an outstanding quota reference, free it now. */
+ /*
+ * If hugetlbfs_put_super couldn't free spool due to an outstanding
+ * quota reference, free it now.
+ */
unlock_or_release_subpool(spool);
return ret;
@@ -923,9 +927,9 @@ void free_huge_page(struct page *page)
ClearPagePrivate(page);
/*
- * A return code of zero implies that the subpool will be under
- * it's minimum size if the reservation is not restored after
- * page is free. Therefore, force restore_reserve operation.
+ * A return code of zero implies that the subpool will be under its
+ * minimum size if the reservation is not restored after page is free.
+ * Therefore, force restore_reserve operation.
*/
if (hugepage_subpool_put_pages(spool, 1) == 0)
restore_reserve = true;
@@ -2523,8 +2527,8 @@ static void hugetlb_vm_op_close(struct v
if (reserve) {
/*
- * decrement reserve counts. The global reserve count
- * may be adjusted if the subpool has a minimum size.
+ * Decrement reserve counts. The global reserve count may be
+ * adjusted if the subpool has a minimum size.
*/
gbl_reserve = hugepage_subpool_put_pages(spool, reserve);
hugetlb_acct_memory(h, -gbl_reserve);
_
--
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