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authorSebastian Ott <sebott@linux.vnet.ibm.com>2014-02-17 14:16:10 +0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2014-02-21 11:50:23 +0400
commitf7e1e65d29636d050cdde0770b9544572959a67d (patch)
tree7cf1d6ffdbc3182ee8c19f6bfdcdfb5a681e8fc6 /drivers/s390/cio/chsc_sch.c
parentfe7c30a420761654777d3cc15412fc7626407e93 (diff)
downloadlinux-f7e1e65d29636d050cdde0770b9544572959a67d.tar.xz
s390: improve debug feature usage
The maximum usable buffer size of the s390 debug feature (when using the sprintf_view) is 11 * sizeof(long) (1 pointer for the format string + 10 arguments). When a larger buffer size is specified the additional memory is unused and wasted per debug entry. So reducing the buffer size to its maximum (or to the actual buffer size used) will make more precious debug feature space usable. For pci_msg, chsc_msg, and cio_crw we use the additional usable dbf space to reduce the number of allocated pages. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/chsc_sch.c')
-rw-r--r--drivers/s390/cio/chsc_sch.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/s390/cio/chsc_sch.c b/drivers/s390/cio/chsc_sch.c
index 7b29d0be0ca3..1d3661af7bd8 100644
--- a/drivers/s390/cio/chsc_sch.c
+++ b/drivers/s390/cio/chsc_sch.c
@@ -173,8 +173,7 @@ static struct css_driver chsc_subchannel_driver = {
static int __init chsc_init_dbfs(void)
{
- chsc_debug_msg_id = debug_register("chsc_msg", 16, 1,
- 16 * sizeof(long));
+ chsc_debug_msg_id = debug_register("chsc_msg", 8, 1, 4 * sizeof(long));
if (!chsc_debug_msg_id)
goto out;
debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);