[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] IOMMU/x86: add perf counters for page table splitting / coalescing
commit e0a417ce62560edea7b0022e62014252c77ba8cb Author: Jan Beulich <jbeulich@xxxxxxxx> AuthorDate: Mon Jul 25 15:42:33 2022 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Mon Jul 25 15:42:33 2022 +0200 IOMMU/x86: add perf counters for page table splitting / coalescing Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> Reviewed-by: Kevin tian <kevin.tian@xxxxxxxxx> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> Reviewed-by: Paul Durrant <paul@xxxxxxx> --- xen/arch/x86/include/asm/perfc_defn.h | 3 +++ xen/drivers/passthrough/amd/iommu_map.c | 4 ++++ xen/drivers/passthrough/vtd/iommu.c | 4 ++++ 3 files changed, 11 insertions(+) diff --git a/xen/arch/x86/include/asm/perfc_defn.h b/xen/arch/x86/include/asm/perfc_defn.h index b07063b7d8..509afc516b 100644 --- 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, "vmexits from realmode") 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__ */ diff --git a/xen/drivers/passthrough/amd/iommu_map.c b/xen/drivers/passthrough/amd/iommu_map.c index 85d3a85fbb..f2157e0043 100644 --- a/xen/drivers/passthrough/amd/iommu_map.c +++ b/xen/drivers/passthrough/amd/iommu_map.c @@ -345,6 +345,8 @@ static int iommu_pde_from_dfn(struct domain *d, unsigned long dfn, level, PTE_kind_table); *flush_flags |= IOMMU_FLUSHF_modified; + + perfc_incr(iommu_pt_shatters); } /* Install lower level page table for non-present entries */ @@ -477,6 +479,7 @@ 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); @@ -543,6 +546,7 @@ 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); } } diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/vtd/iommu.c index 35545bfaef..496d2d50ee 100644 --- 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(struct domain *domain, daddr_t addr, if ( flush_flags ) *flush_flags |= IOMMU_FLUSHF_modified; + + perfc_incr(iommu_pt_shatters); } write_atomic(&pte->val, new_pte.val); @@ -857,6 +859,7 @@ static int dma_pte_clear_one(struct domain *domain, daddr_t addr, *flush_flags |= IOMMU_FLUSHF_all; iommu_queue_free_pgtable(hd, pg); + perfc_incr(iommu_pt_coalesces); } spin_unlock(&hd->arch.mapping_lock); @@ -2239,6 +2242,7 @@ static int __must_check cf_check intel_iommu_map_page( *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); -- generated by git-patchbot for /home/xen/git/xen.git#master
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