NFS: Optimize allocation of nfs_read/write_data structures

Clean up use of page_array, and fix an off-by-one error noticed by Tom
Talpey which causes kmalloc calls in cases where using the page_array
is sufficient.

Test plan:
Normal client functional testing with r/wsize=32768.

Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2006-05-25 01:40:53 -04:00 коммит произвёл Trond Myklebust
Родитель bf3fcf8955
Коммит 0d0b5cb36f
3 изменённых файлов: 13 добавлений и 20 удалений

Просмотреть файл

@ -51,14 +51,11 @@ struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount)
if (p) {
memset(p, 0, sizeof(*p));
INIT_LIST_HEAD(&p->pages);
if (pagecount < NFS_PAGEVEC_SIZE)
p->pagevec = &p->page_array[0];
if (pagecount <= ARRAY_SIZE(p->page_array))
p->pagevec = p->page_array;
else {
size_t size = ++pagecount * sizeof(struct page *);
p->pagevec = kmalloc(size, GFP_NOFS);
if (p->pagevec) {
memset(p->pagevec, 0, size);
} else {
p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
if (!p->pagevec) {
mempool_free(p, nfs_rdata_mempool);
p = NULL;
}

Просмотреть файл

@ -98,11 +98,10 @@ struct nfs_write_data *nfs_commit_alloc(unsigned int pagecount)
if (p) {
memset(p, 0, sizeof(*p));
INIT_LIST_HEAD(&p->pages);
if (pagecount < NFS_PAGEVEC_SIZE)
p->pagevec = &p->page_array[0];
if (pagecount <= ARRAY_SIZE(p->page_array))
p->pagevec = p->page_array;
else {
size_t size = ++pagecount * sizeof(struct page *);
p->pagevec = kzalloc(size, GFP_NOFS);
p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
if (!p->pagevec) {
mempool_free(p, nfs_commit_mempool);
p = NULL;
@ -126,14 +125,11 @@ struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
if (p) {
memset(p, 0, sizeof(*p));
INIT_LIST_HEAD(&p->pages);
if (pagecount < NFS_PAGEVEC_SIZE)
p->pagevec = &p->page_array[0];
if (pagecount <= ARRAY_SIZE(p->page_array))
p->pagevec = p->page_array;
else {
size_t size = ++pagecount * sizeof(struct page *);
p->pagevec = kmalloc(size, GFP_NOFS);
if (p->pagevec) {
memset(p->pagevec, 0, size);
} else {
p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
if (!p->pagevec) {
mempool_free(p, nfs_wdata_mempool);
p = NULL;
}

Просмотреть файл

@ -694,7 +694,7 @@ struct nfs_read_data {
#ifdef CONFIG_NFS_V4
unsigned long timestamp; /* For lease renewal */
#endif
struct page *page_array[NFS_PAGEVEC_SIZE + 1];
struct page *page_array[NFS_PAGEVEC_SIZE];
};
struct nfs_write_data {
@ -712,7 +712,7 @@ struct nfs_write_data {
#ifdef CONFIG_NFS_V4
unsigned long timestamp; /* For lease renewal */
#endif
struct page *page_array[NFS_PAGEVEC_SIZE + 1];
struct page *page_array[NFS_PAGEVEC_SIZE];
};
struct nfs_access_entry;