From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michel Thierry Subject: Re: [PATCH 00/24] PPGTT dynamic page allocations Date: Fri, 19 Dec 2014 12:35:19 +0000 Message-ID: <54941B87.2080307@intel.com> References: <1418922621-25818-1-git-send-email-michel.thierry@intel.com> <20141218211622.GA2711@phenom.ffwll.local> <20141219083103.GC554@nuc-i3427.alporthouse.com> <20141219083752.GE2711@phenom.ffwll.local> <20141219085009.GD554@nuc-i3427.alporthouse.com> <20141219101351.GG2711@phenom.ffwll.local> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0759667569==" Return-path: Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTP id C2B306E5E5 for ; Fri, 19 Dec 2014 04:35:23 -0800 (PST) In-Reply-To: <20141219101351.GG2711@phenom.ffwll.local> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Daniel Vetter Cc: intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org This is a cryptographically signed message in MIME format. --===============0759667569== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms080404000700070205020105" This is a cryptographically signed message in MIME format. --------------ms080404000700070205020105 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: quoted-printable On 12/19/2014 10:13 AM, Daniel Vetter wrote: > On Fri, Dec 19, 2014 at 08:50:09AM +0000, Chris Wilson wrote: >> On Fri, Dec 19, 2014 at 09:37:52AM +0100, Daniel Vetter wrote: >>> On Fri, Dec 19, 2014 at 08:31:03AM +0000, Chris Wilson wrote: >>>> On Thu, Dec 18, 2014 at 10:16:22PM +0100, Daniel Vetter wrote: >>>>> On Thu, Dec 18, 2014 at 05:09:57PM +0000, Michel Thierry wrote: >>>>>> This new version tries to remove as many unnecessary changes as po= ssible from >>>>>> the previous RFC. >>>>>> =20 >>>>>> For GEN8, it has also been extended to work in logical ring submis= sion (lrc) >>>>>> mode, as it will be the preferred mode of operation. >>>>>> I also tried to update the lrc code at the same time the ppgtt ref= actoring >>>>>> occurred, leaving only one patch that is exclusively for lrc. >>>>>> >>>>>> This list can be seen in 3 parts: >>>>>> [01-10] Include code rework for PPGTT (all GENs). >>>>>> [11-14] Adds page table allocation for GEN6/GEN7 >>>>>> [15-24] Enables dynamic allocation in GEN8. It is enabled for both= legacy >>>>>> and execlist submission modes. >>>>>> >>>>>> Ben Widawsky (23): >>>>>> drm/i915: Add some extra guards in evict_vm >>>>>> drm/i915/trace: Fix offsets for 64b >>>>>> drm/i915: Rename to GEN8_LEGACY_PDPES >>>>>> drm/i915: Setup less PPGTT on failed pagedir >>>>>> drm/i915/gen8: Un-hardcode number of page directories >>>>>> drm/i915: Range clearing is PPGTT agnostic >>>>>> drm/i915: page table abstractions >>>>>> drm/i915: Complete page table structures >>>>>> drm/i915: Create page table allocators >>>>>> drm/i915: Track GEN6 page table usage >>>>>> drm/i915: Extract context switch skip logic >>>>>> drm/i915: Track page table reload need >>>>>> drm/i915: Initialize all contexts >>>>>> drm/i915: Finish gen6/7 dynamic page table allocation >>>>>> drm/i915/bdw: Use dynamic allocation idioms on free >>>>>> drm/i915/bdw: pagedirs rework allocation >>>>>> drm/i915/bdw: pagetable allocation rework >>>>>> drm/i915/bdw: Update pdp switch and point unused PDPs to scratc= h page >>>>>> drm/i915: num_pd_pages/num_pd_entries isn't useful >>>>>> drm/i915: Extract PPGTT param from pagedir alloc >>>>>> drm/i915/bdw: Split out mappings >>>>>> drm/i915/bdw: begin bitmap tracking >>>>>> drm/i915/bdw: Dynamic page table allocations >>>>>> >>>>>> Michel Thierry (1): >>>>>> drm/i915/bdw: Dynamic page table allocations in lrc mode >>>>> Ok, I've tried to read through this series again and I definitely s= ee a >>>>> bit clearer, but it's still fairly confusing to me. I think that's = just >>>>> the long history of this patch series - often it seems to do someth= ing and >>>>> then undo it again in some later patch. Which doesn't help understa= nding >>>>> it. >>>>> >>>>> I've replied with a few comments. Imo the way forward with this is = to >>>>> read, understand and review it from the beginning and merge while t= hat's >>>>> happening. It will probably take a few rounds until all the confusi= on is >>>>> cleared up and we've reached the last patch. >>>> I honestly think this is starting off in the wrong direction. The fi= rst >>>> task, imo, is to make the current PD swappable. Then, we can introdu= ce >>>> infrastructure to do deferred page allocation, hopefully combining w= ith >>>> an approach to allow userspace to similarly defer their page allocat= ion. >>> Thus far things started to blow up because we need a bit too much mem= ory >>> in testcases so we need this. We'll probably need the pd swapping >>> eventually, too. But only on gen7, and atm it doesn't look good for p= pgtt >>> on gen7 still. Given that I think the priorities are right for now. >>> >>> But yeah we need to keep this in mind for gen7 full ppgtt. >> Certainly making the toplevel PD swappable on BDW is less of a priorit= y, >> since that should also be already done as part of execlists (and it is= so >> much smaller). I would like to see the gen6/7 deferred allocation >> removed from this series, as I still consider it to be the wrong initi= al >> approach (and making the current gen7 full-ppgtt swappable is rather >> trivial). > I don't understand why you'd want to hold up the delayed pagetable allo= c > until the pd is evictable. Imo these are fairly orthogoanl issues: pd > eviction tries to make ggtt space reclaimable, while deferred pagetable= > alloc ensure that we don't alloc 2M of pagetables (which are system > memory) in the lower level when not needed. So imo we can go ahead with= > both in parallel. There might be some minor conflicts between this seri= es > and making pd ggtt blocks evictable around pd reloading, but noting > fundamental. > > Or are we talking past each another? Just wondering since you call it > "swappable pd" and I can't really think of a way we could swap out pds = to > disk on gen7 (they just block ggtt space which can't be used for real p= tes > any more). > -Daniel Thanks for the quick review. I'll make the changes (and try to tidy up the commit messages). In particular, I agree it's better to decouple alloc and bind_vma. -Michel --------------ms080404000700070205020105 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIRkjCC BOswggPToAMCAQICEFLpAsoR6ESdlGU4L6MaMLswDQYJKoZIhvcNAQEFBQAwbzELMAkGA1UE BhMCU0UxFDASBgNVBAoTC0FkZFRydXN0IEFCMSYwJAYDVQQLEx1BZGRUcnVzdCBFeHRlcm5h bCBUVFAgTmV0d29yazEiMCAGA1UEAxMZQWRkVHJ1c3QgRXh0ZXJuYWwgQ0EgUm9vdDAeFw0x MzAzMTkwMDAwMDBaFw0yMDA1MzAxMDQ4MzhaMHkxCzAJBgNVBAYTAlVTMQswCQYDVQQIEwJD QTEUMBIGA1UEBxMLU2FudGEgQ2xhcmExGjAYBgNVBAoTEUludGVsIENvcnBvcmF0aW9uMSsw KQYDVQQDEyJJbnRlbCBFeHRlcm5hbCBCYXNpYyBJc3N1aW5nIENBIDRBMIIBIjANBgkqhkiG 9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4LDMgJ3YSVX6A9sE+jjH3b+F3Xa86z3LLKu/6WvjIdvU bxnoz2qnvl9UKQI3sE1zURQxrfgvtP0bPgt1uDwAfLc6H5eqnyi+7FrPsTGCR4gwDmq1WkTQ 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