lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

GFS2: Cache the most recently used resource group in the inode

Browse Source 
This means that after the initial allocation for any inode, the
last used resource group is cached in the inode for future use.
This drastically reduces the number of lookups of resource
groups in the common case, and this the contention on that
data structure.

The allocation algorithm is the same as previously, except that we
always check to see if the goal block is within the cached rgrp
first before going to the rbtree to look one up.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse
2011-09-01 13:31:59 +01:00
parent 8339ee543e
commit 54335b1fca
9 changed files with 44 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
fs/gfs2/aops.c
View File

@ -663,7 +663,7 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping,
if (&ip->i_inode == sdp->sd_rindex)
rblocks += 2 * RES_STATFS;
if (alloc_required)
rblocks += gfs2_rg_blocks(al);
rblocks += gfs2_rg_blocks(ip);
error = gfs2_trans_begin(sdp, rblocks,
PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);