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NFS cleanup: speed up nfs_scan_commit using radix tree tags 

Add a tag for requests that are waiting for a COMMIT

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2007-06-17 15:27:42 -04:00
parent 9fd367f0f3
commit 5c36968343
3 changed files with 15 additions and 10 deletions
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14
fs/nfs/pagelist.c
View File

@ -381,10 +381,10 @@ void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index)
/**
* nfs_scan_list - Scan a list for matching requests
* @nfsi: NFS inode
* @head: One of the NFS inode request lists
* @dst: Destination list
* @idx_start: lower bound of page->index to scan
* @npages: idx_start + npages sets the upper bound to scan.
* @tag: tag to scan for
*
* Moves elements from one of the inode request lists.
* If the number of requests is set to 0, the entire address_space
@ -392,9 +392,9 @@ void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index)
* The requests are *not* checked to ensure that they form a contiguous set.
* You must be holding the inode's req_lock when calling this function
*/
int nfs_scan_list(struct nfs_inode *nfsi, struct list_head *head,
int nfs_scan_list(struct nfs_inode *nfsi,
struct list_head *dst, pgoff_t idx_start,
unsigned int npages)
unsigned int npages, int tag)
{
struct nfs_page *pgvec[NFS_SCAN_MAXENTRIES];
struct nfs_page *req;
@ -409,9 +409,9 @@ int nfs_scan_list(struct nfs_inode *nfsi, struct list_head *head,
idx_end = idx_start + npages - 1;
for (;;) {
found = radix_tree_gang_lookup(&nfsi->nfs_page_tree,
found = radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree,
(void **)&pgvec[0], idx_start,
NFS_SCAN_MAXENTRIES);
NFS_SCAN_MAXENTRIES, tag);
if (found <= 0)
break;
for (i = 0; i < found; i++) {
@ -419,10 +419,10 @@ int nfs_scan_list(struct nfs_inode *nfsi, struct list_head *head,
if (req->wb_index > idx_end)
goto out;
idx_start = req->wb_index + 1;
if (req->wb_list_head != head)
continue;
if (nfs_set_page_tag_locked(req)) {
nfs_list_remove_request(req);
radix_tree_tag_clear(&nfsi->nfs_page_tree,
req->wb_index, tag);
nfs_list_add_request(req, dst);
res++;
}

6
fs/nfs/write.c
View File

@ -462,6 +462,9 @@ nfs_mark_request_commit(struct nfs_page *req)
nfs_list_add_request(req, &nfsi->commit);
nfsi->ncommit++;
set_bit(PG_NEED_COMMIT, &(req)->wb_flags);
radix_tree_tag_set(&nfsi->nfs_page_tree,
req->wb_index,
NFS_PAGE_TAG_COMMIT);
spin_unlock(&nfsi->req_lock);
inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
@ -575,7 +578,8 @@ nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, u
int res = 0;
if (nfsi->ncommit != 0) {
res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages);
res = nfs_scan_list(nfsi, dst, idx_start, npages,
NFS_PAGE_TAG_COMMIT);
nfsi->ncommit -= res;
if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit))
printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n");

5
include/linux/nfs_page.h
View File

@ -22,6 +22,7 @@
* Valid flags for the radix tree
*/
#define NFS_PAGE_TAG_LOCKED 0
#define NFS_PAGE_TAG_COMMIT 1
/*
* Valid flags for a dirty buffer
@ -71,8 +72,8 @@ extern void nfs_clear_request(struct nfs_page *req);
extern void nfs_release_request(struct nfs_page *req);
extern int nfs_scan_list(struct nfs_inode *nfsi, struct list_head *head, struct list_head *dst,
pgoff_t idx_start, unsigned int npages);
extern int nfs_scan_list(struct nfs_inode *nfsi, struct list_head *dst,
pgoff_t idx_start, unsigned int npages, int tag);
extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
struct inode *inode,
int (*doio)(struct inode *, struct list_head *, unsigned int, size_t, int),