Messages in this thread Patch in this message | | | From | Joerg Roedel <> | Subject | [PATCH 11/22] AMD IOMMU: add stats counter for completion wait events | Date | Mon, 15 Dec 2008 15:17:54 +0100 |
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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
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