NFS: Use cond_resched_lock() to reduce latencies in the commit scans
Ensure that we conditionally drop the inode->i_lock when it is safe
to do so in the commit loops.
We do so after locking the nfs_page, but before removing it from the
commit list. We can then use list_safe_reset_next to recover the loop
after the lock is retaken.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index e98ff30..0780265 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -97,7 +97,7 @@
void (*mark_request_commit) (struct nfs_page *req,
struct pnfs_layout_segment *lseg);
void (*clear_request_commit) (struct nfs_page *req);
- int (*scan_commit_lists) (struct inode *inode, int max);
+ int (*scan_commit_lists) (struct inode *inode, int max, spinlock_t *lock);
int (*commit_pagelist)(struct inode *inode, struct list_head *mds_pages, int how);
/*
@@ -294,14 +294,14 @@
}
static inline int
-pnfs_scan_commit_lists(struct inode *inode, int max)
+pnfs_scan_commit_lists(struct inode *inode, int max, spinlock_t *lock)
{
struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
int ret;
if (ld == NULL || ld->scan_commit_lists == NULL)
return 0;
- ret = ld->scan_commit_lists(inode, max);
+ ret = ld->scan_commit_lists(inode, max, lock);
if (ret != 0)
set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
return ret;
@@ -419,7 +419,7 @@
}
static inline int
-pnfs_scan_commit_lists(struct inode *inode, int max)
+pnfs_scan_commit_lists(struct inode *inode, int max, spinlock_t *lock)
{
return 0;
}