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allocate/de-allocate exact number of pages requested

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derived from:
commit 3ba275833ac741db59ec9a614297aef9f01da908
Author: Masamichi Takagi m-takagi@ab.jp.nec.com <takagi@kncc12.(none)>
Date:   Thu Jan 17 17:34:12 2013 +0900

    make aal reserve exact number of physical pages even when requested >= 32 pages
This commit is contained in:
NAKAMURA Gou
2013-05-31 18:25:01 +09:00
parent d836b92bc2
commit 6614bcaa68
1 changed files with 17 additions and 10 deletions
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27
lib/page_alloc.c
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@ -88,10 +88,21 @@ void ihk_pagealloc_destroy(void *__desc)
}
static unsigned long __ihk_pagealloc_large(struct ihk_page_allocator_desc *desc,
int nblocks)
int npages)
{
unsigned long flags;
unsigned int i, j, mi;
int nblocks;
int nfrags;
unsigned long mask;
nblocks = (npages / 64);
mask = -1;
nfrags = (npages % 64);
if (nfrags > 0) {
++nblocks;
mask = (1UL << nfrags) - 1;
}
flags = ihk_mc_spinlock_lock(&desc->lock);
for (i = 0, mi = desc->last; i < desc->count; i++, mi++) {
@ -101,15 +112,16 @@ static unsigned long __ihk_pagealloc_large(struct ihk_page_allocator_desc *desc,
if (mi + nblocks >= desc->count) {
continue;
}
for (j = mi; j < mi + nblocks; j++) {
for (j = mi; j < mi + nblocks - 1; j++) {
if (desc->map[j]) {
break;
}
}
if (j == mi + nblocks) {
for (j = mi; j < mi + nblocks; j++) {
if ((j == (mi + nblocks - 1)) && !(desc->map[j] & mask)) {
for (j = mi; j < mi + nblocks - 1; j++) {
desc->map[j] = (unsigned long)-1;
}
desc->map[j] |= mask;
ihk_mc_spinlock_unlock(&desc->lock, flags);
return ADDRESS(desc, mi, 0);
}
@ -126,10 +138,8 @@ unsigned long ihk_pagealloc_alloc(void *__desc, int npages)
int j;
unsigned long v, mask, flags;
/* If requested page is more than the half of the element,
* we allocate the whole element (ulong) */
if (npages >= 32) {
return __ihk_pagealloc_large(desc, (npages + 63) >> 6);
return __ihk_pagealloc_large(desc, npages);
}
mask = (1UL << npages) - 1;
@ -191,9 +201,6 @@ void ihk_pagealloc_free(void *__desc, unsigned long address, int npages)
unsigned long flags;
/* XXX: Parameter check */
if (npages >= 32) {
npages = (npages + 63) & ~63;
}
flags = ihk_mc_spinlock_lock(&desc->lock);
mi = (address - desc->start) >> desc->shift;
for (i = 0; i < npages; i++, mi++) {