linux/fs/ocfs2/cluster
Jia Guo 874b1ef0ef ocfs2: optimize the reading of heartbeat data
Reading heartbeat data from lowest node rather than from zero, in cases
where the node is not defined from zero, can reduce the number of sectors
read.

Here is a simple test data obtained with 'iostat -dmx dm-5 2', with
two nodes in the cluster, node number 10, 20, respectively.

Before optimization:
Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
dm-5              0.00     0.00    0.50    0.50     0.01     0.00    11.00     0.00    1.00    1.00    1.00   1.50   0.15

After the optimization:
Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
dm-5              0.00     0.00    0.50    0.50     0.00     0.00     6.00     0.00    0.50    1.00    0.00   0.50   0.05

Link: http://lkml.kernel.org/r/99fe4988-69ac-3615-a218-3042fe6fbe72@huawei.com
Signed-off-by: Jia Guo <guojia12@huawei.com>
Reviewed-by: Jun Piao <piaojun@huawei.com>
Reviewed-by: Yiwen Jiang <jiangyiwen@huawei.com>
Acked-by: Joseph Qi <jiangqi903@gmail.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <ge.changwei@h3c.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-12-28 12:11:45 -08:00
..
heartbeat.c ocfs2: optimize the reading of heartbeat data 2018-12-28 12:11:45 -08:00
heartbeat.h ocfs2: cleanup unused func declaration and assignment 2017-11-15 18:21:01 -08:00
Makefile ocfs2: remove versioning information 2014-01-21 16:19:41 -08:00
masklog.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
masklog.h ocfs2: free up write context when direct IO failed 2018-11-18 10:15:09 -08:00
netdebug.c ocfs2: free 'dummy_sc' in sc_fop_release() to prevent memory leak 2017-07-06 16:24:30 -07:00
nodemanager.c ocfs2: make several functions and variables static (and some const) 2018-08-17 16:20:28 -07:00
nodemanager.h
ocfs2_heartbeat.h
ocfs2_nodemanager.h
quorum.c ocfs2/cluster: close a race that fence can't be triggered 2018-01-31 17:18:35 -08:00
quorum.h
sys.c VERIFY_OCTAL_PERMISSIONS: stricter checking for sysfs perms. 2014-03-24 12:21:00 +10:30
sys.h
tcp_internal.h ocfs2/cluster: neaten a member of o2net_msg_handler 2018-01-31 17:18:34 -08:00
tcp.c iov_iter: Separate type from direction and use accessor functions 2018-10-24 00:41:07 +01:00
tcp.h ocfs2: o2net: set tcp user timeout to max value 2014-08-29 16:28:16 -07:00