[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v4 19/21] IOMMU/x86: add perf counters for page table splitting / coalescing
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> Reviewed-by: Kevin tian <kevin.tian@xxxxxxxxx> --- v3: New. --- a/xen/arch/x86/include/asm/perfc_defn.h +++ b/xen/arch/x86/include/asm/perfc_defn.h @@ -125,4 +125,7 @@ PERFCOUNTER(realmode_exits, "vmexit PERFCOUNTER(pauseloop_exits, "vmexits from Pause-Loop Detection") +PERFCOUNTER(iommu_pt_shatters, "IOMMU page table shatters") +PERFCOUNTER(iommu_pt_coalesces, "IOMMU page table coalesces") + /*#endif*/ /* __XEN_PERFC_DEFN_H__ */ --- a/xen/drivers/passthrough/amd/iommu_map.c +++ b/xen/drivers/passthrough/amd/iommu_map.c @@ -343,6 +343,8 @@ static int iommu_pde_from_dfn(struct dom level, PTE_kind_table); *flush_flags |= IOMMU_FLUSHF_modified; + + perfc_incr(iommu_pt_shatters); } /* Install lower level page table for non-present entries */ @@ -472,6 +474,7 @@ int cf_check amd_iommu_map_page( flags & IOMMUF_readable, &contig); *flush_flags |= IOMMU_FLUSHF_modified | IOMMU_FLUSHF_all; iommu_queue_free_pgtable(hd, pg); + perfc_incr(iommu_pt_coalesces); } spin_unlock(&hd->arch.mapping_lock); @@ -532,6 +535,7 @@ int cf_check amd_iommu_unmap_page( clear_iommu_pte_present(pt_mfn, dfn_x(dfn), level, &free); *flush_flags |= IOMMU_FLUSHF_all; iommu_queue_free_pgtable(hd, pg); + perfc_incr(iommu_pt_coalesces); } } --- a/xen/drivers/passthrough/vtd/iommu.c +++ b/xen/drivers/passthrough/vtd/iommu.c @@ -404,6 +404,8 @@ static uint64_t addr_to_dma_page_maddr(s if ( flush_flags ) *flush_flags |= IOMMU_FLUSHF_modified; + + perfc_incr(iommu_pt_shatters); } write_atomic(&pte->val, new_pte.val); @@ -865,6 +867,7 @@ static int dma_pte_clear_one(struct doma *flush_flags |= IOMMU_FLUSHF_all; iommu_queue_free_pgtable(hd, pg); + perfc_incr(iommu_pt_coalesces); } spin_unlock(&hd->arch.mapping_lock); @@ -2244,6 +2247,7 @@ static int __must_check cf_check intel_i *flush_flags |= IOMMU_FLUSHF_modified | IOMMU_FLUSHF_all; iommu_queue_free_pgtable(hd, pg); + perfc_incr(iommu_pt_coalesces); } spin_unlock(&hd->arch.mapping_lock);
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