lkml.org 
[lkml]   [2008]   [Dec]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 11/22] AMD IOMMU: add stats counter for completion wait events
Date
Impact: see number of completion wait events in debugfs

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/amd_iommu.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index be1ddca..a494a98 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -63,6 +63,8 @@ static struct dma_ops_domain *find_protection_domain(u16 devid);
* Initialization code for statistics collection
*/

+DECLARE_STATS_COUNTER(compl_wait);
+
static struct dentry *stats_dir;
static struct dentry *de_isolate;
static struct dentry *de_fflush;
@@ -87,6 +89,8 @@ static void amd_iommu_stats_init(void)

de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir,
(u32 *)&amd_iommu_unmap_flush);
+
+ amd_iommu_stats_add(&compl_wait);
}

#endif
@@ -248,6 +252,8 @@ static void __iommu_wait_for_completion(struct amd_iommu *iommu)
unsigned status = 0;
unsigned long i = 0;

+ INC_STATS_COUNTER(compl_wait);
+
while (!ready && (i < EXIT_LOOP_COUNT)) {
++i;
/* wait for the bit to become one */
--
1.5.6.4



\
 
 \ /
  Last update: 2008-12-15 15:27    [W:0.067 / U:0.168 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site