From: Peter Zijlstra <peterz@infradead.org>
To: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Cc: joro@8bytes.org, bp@alien8.de, mingo@redhat.com, acme@kernel.org,
andihartmann@freenet.de, linux-kernel@vger.kernel.org,
iommu@lists.linux-foundation.org
Subject: Re: [PATCH V4 5/6] perf/amd/iommu: Enable support for multiple IOMMUs
Date: Mon, 22 Feb 2016 15:07:41 +0100 [thread overview]
Message-ID: <20160222140741.GH6357@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <56CAC01F.8090800@amd.com>
On Mon, Feb 22, 2016 at 03:00:31PM +0700, Suravee Suthikulpanit wrote:
> >So I really don't have time to review new muck while I'm hunting perf
> >core fail, but Boris made me look at this.
> >
> >This is crazy, if you have multiple IOMMUs then create an event per
> >IOMMU, do _NOT_ fold them all into a single event.
>
> These are system-wide events, which are programmed on every IOMMU the same
> way. I am not sure what you meant by creating an event per IOMMU. Do you
> mean I should create internal per-IOMMU struct perf_event for each event?
No, I meant to expose each IOMMU individually to userspace, as a
separate device.
Is there never a case to profile just one of the IOMMUs ?
next prev parent reply other threads:[~2016-02-22 14:08 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-11 9:15 [PATCH V4 0/6] perf/amd/iommu: Enable multi-IOMMU support Suravee Suthikulpanit
2016-02-11 9:15 ` [PATCH V4 1/6] perf/amd/iommu: Consolidate and move perf_event_amd_iommu header Suravee Suthikulpanit
2016-02-11 9:15 ` [PATCH V4 2/6] perf/amd/iommu: Modify functions to query max banks and counters Suravee Suthikulpanit
2016-02-18 11:11 ` Borislav Petkov
2016-02-22 4:55 ` Suravee Suthikulpanit
2016-02-11 9:15 ` [PATCH V4 3/6] iommu/amd: Introduce amd_iommu_get_num_iommus() Suravee Suthikulpanit
2016-02-11 9:15 ` [PATCH V4 4/6] perf/amd/iommu: Introduce get_iommu_bnk_cnt_evt_idx Suravee Suthikulpanit
2016-02-18 11:45 ` Borislav Petkov
2016-02-11 9:15 ` [PATCH V4 5/6] perf/amd/iommu: Enable support for multiple IOMMUs Suravee Suthikulpanit
2016-02-18 13:18 ` Peter Zijlstra
2016-02-22 8:00 ` Suravee Suthikulpanit
2016-02-22 14:07 ` Peter Zijlstra [this message]
2016-02-23 5:12 ` Suravee Suthikulpanit
2016-02-23 5:24 ` Alex Williamson
2016-02-23 9:56 ` Suravee Suthikulpanit
2016-02-18 13:21 ` Borislav Petkov
2016-02-11 9:15 ` [PATCH V4 6/6] perf/amd/iommu: Clean up print messages pr_debug Suravee Suthikulpanit
2016-02-18 13:22 ` Borislav Petkov
2016-02-18 2:30 ` [PATCH V4 0/6] perf/amd/iommu: Enable multi-IOMMU support Suravee Suthikulpanit
2016-02-23 11:04 ` Joerg Roedel
2016-02-23 11:27 ` Suravee Suthikulpanit
2016-02-23 11:39 ` Suravee Suthikulpanit
2016-02-23 12:12 ` [PATCH] iommu/amd: Fix boot warning when device 00:00.0 is not iommu Joerg Roedel
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