Another use for huge page TLB entries

Article: Silvermont, Intel's Low Power Architecture
By: Ungo (a.delete@this.b.c.d.e), May 16, 2013 3:54 pm
Room: Moderated Discussions
Maynard Handley (name99.delete@this.name99.org) on May 15, 2013 3:33 pm wrote:
> I don't know my way around the Darwin source tree, but both a manual exploration and a Google
> site specific search did not reveal anything helpful. There IS a malloc.c (not in the xnu tree,
> but at http://www.opensource.apple.com/source/Libc/Libc-498/gen/malloc.c), however it is basically
> a thin adaptor layer between the malloc API and an internal zone-based API. The zone calls live
> in objc/zone.c, and a google search did not turn up a public version of that file.

They're now up to Libc-825.26; 498 is rather old.

Also you're looking in the wrong place for the zone implementation. Maybe you were keying off the inclusion of objc/zone.h in Libc-498/gen/malloc.c? They've removed that include some time between then and now. I suspect it was never a zone implementation, it seems likely to be the Obj-C interface to malloc_zone_register() etc.

What we're really looking for is the default zone implementation, the one you get from userspace when calling plain malloc() without registering your own zone. _malloc_initialize() in malloc.c creates the default zone with this call:

zone = create_scalable_zone(0, malloc_debug_flags);

Libc-825.26 has two files which implement the "scalable_zone" allocator: scalable_malloc.c and magazine_malloc.c. They appear to be different versions of the same code, and magazine_malloc.c appears to be the current one. After a brief scan through the code, all paths appear to allocate pages with mmap().

Which is why I suggested looking in XNU. Libc malloc() code (or application-supplied code which uses the zone plugin hooks to add one or more malloc() implementations of its own) ultimately can't do anything but ask the kernel for blocks of virtual addresses to subdivide. So the information you need is whether XNU itself supports large pages, and if so, when it chooses to use them.

Some digging suggests that it does, but it's limited (e.g. it looks like large pages are always wired). Download the full 10.8.3 xnu tarball and search it for "superpage" (case insensitive).
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      Another use for huge page TLB entriesMaynard Handley2013/05/14 05:49 PM
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                      quad-core since Nov 2006mpx2013/05/13 01:34 AM
                        quad-core since Nov 2006RichardC2013/05/13 03:48 AM
                          quad-core since Nov 2006Jukka Larja2013/05/14 11:34 AM
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                      * browsers are moving to a process per tab model (NT)Ricardo B2013/05/12 05:54 PM
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                          SMT is a dodo birdJouni Osmala2013/05/17 10:27 AM
                          SMT is a dodo birdBrett2013/05/17 07:26 PM
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                  SMT is a dodo birdRichardC2013/05/12 06:57 AM
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                SMT is a dodo birdStubabe2013/05/14 12:09 PM
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                      SMT is a dodo birdRichardC2013/05/14 06:27 PM
                        SMT is a dodo birdRicardo B2013/05/15 03:50 AM
                          SMT is a dodo birdRichardC2013/05/15 08:53 AM
                            SMT is a dodo birdRicardo B2013/05/15 09:31 AM
                              SMT is a dodo birdRichardC2013/05/15 11:13 AM
                                SMT is a dodo birdRicardo B2013/05/15 12:43 PM
                                  SMT is a dodo birdRichardC2013/05/15 01:15 PM
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                      Using the available die areaStubabe2013/05/16 11:26 AM
                        Using the available die areaRicardo B2013/05/16 02:05 PM
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                  How Does Silvermont Compare To A15?TREZA2013/05/16 03:17 AM
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                    How Does Silvermont Compare To A15?Exophase2013/05/17 08:52 AM
                      How Does Silvermont Compare To A15?David Kanter2013/05/17 09:38 PM
                        How Does Silvermont Compare To A15?Exophase2013/05/17 10:33 PM
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                            FYI Tegra4 has A15 in it also, so 3 devicesMichael S2013/05/22 03:21 AM
                              FYI Tegra4 has A15 in it also, so 3 devicesS. Rao2013/05/22 10:06 AM
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                        Silvermont architecture in-depth articleSebastian Soeiro2013/05/30 03:39 PM
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                                Silvermont architecture in-depth articleSebastian Soeiro2013/05/31 06:59 AM
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                                                Silvermont architecture in-depth articleSebastian Soeiro2013/06/08 08:30 AM
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                                        Silvermont architecture in-depth articleSebastian Soeiro2013/05/31 09:04 PM
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                                                  Silvermont architecture in-depth articleDavid Kanter2013/06/02 11:10 PM
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                                              Silvermont architecture in-depth articlerwessel2013/06/03 12:09 AM
                                                Silvermont architecture in-depth articleSebastian Soeiro2013/06/03 09:59 AM
                                                  Silvermont architecture in-depth articlerwessel2013/06/03 10:51 AM
                                                    Silvermont architecture in-depth articleSebastian Soeiro2013/06/04 06:31 PM
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                                        Silvermont architecture in-depth articleSebastian Soeiro2013/05/31 06:59 PM
                                          Silvermont architecture in-depth articlerwessel2013/05/31 09:02 PM
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                                            Quibbling on multithreadingPaul A. Clayton2013/06/01 10:11 AM
                                              Quibbling on multithreadingrwessel2013/06/02 11:54 PM
                                                Exploiting for SMT was my "contribution"Paul A. Clayton2013/06/03 04:53 AM
                                            Silvermont architecture in-depth articleMichael S2013/06/01 10:49 AM
                        Silvermont architecture in-depth articleRicardo B2013/05/30 04:41 PM
                          Didn't notice how this was to be organized...Sebastian Soeiro2013/05/30 07:55 PM
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            Of course. Not enough sleep. (NT)Ricardo B2013/05/29 02:27 PM
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      No out-of-order in FP cluster of silvermont?Exophase2013/06/28 01:54 PM
        No out-of-order in FP cluster of silvermont?Michael S2013/06/29 11:21 AM
          No out-of-order in FP cluster of silvermont?Exophase2013/06/29 09:07 PM
      No out-of-order in FP cluster of silvermont?Linus Torvalds2013/06/29 12:22 PM
        No out-of-order in FP cluster of silvermont?anon2013/06/29 05:26 PM
          No out-of-order in FP cluster of silvermont?EduardoS2013/06/29 06:50 PM
            No out-of-order in FP cluster of silvermont?anon2013/06/29 09:15 PM
              No out-of-order in FP cluster of silvermont?EduardoS2013/06/29 09:31 PM
                No out-of-order in FP cluster of silvermont?anon2013/06/30 02:53 AM
                  No out-of-order in FP cluster of silvermont?EduardoS2013/06/30 05:24 AM
                    No out-of-order in FP cluster of silvermont?anon2013/06/30 10:41 AM
                      No out-of-order in FP cluster of silvermont?EduardoS2013/06/30 01:26 PM
                        No out-of-order in FP cluster of silvermont?anon2013/07/01 12:32 AM
                          No out-of-order in FP cluster of silvermont?EduardoS2013/07/01 05:40 PM
                            No out-of-order in FP cluster of silvermont?anon2013/07/01 06:44 PM
                            No out-of-order in FP cluster of silvermont?Michael S2013/07/02 05:40 AM
                              No out-of-order in FP cluster of silvermont?Exophase2013/07/02 09:03 AM
                              No out-of-order in FP cluster of silvermont?EduardoS2013/07/02 05:20 PM
                          No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 09:25 AM
                      No out-of-order in FP cluster of silvermont?Etienne2013/07/02 04:36 AM
                        No out-of-order in FP cluster of silvermont?anon2013/07/02 07:13 AM
                          No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 10:03 AM
                            No out-of-order in FP cluster of silvermont?anon2013/07/02 04:12 PM
                              No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 04:43 PM
                                No out-of-order in FP cluster of silvermont?anon2013/07/02 05:47 PM
                                  No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 07:36 PM
                                    No out-of-order in FP cluster of silvermont?anon2013/07/02 09:03 PM
                                      No out-of-order in FP cluster of silvermont?Symmetry2013/07/03 07:14 AM
                                        No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/03 09:04 PM
                                          No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/04 03:23 AM
                        No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 10:01 AM
                          No out-of-order in FP cluster of silvermont?Etienne2013/07/03 03:26 AM
                            layer 2 cache behaviourEtienne2013/07/05 03:14 AM
                              layer 2 cache behaviourMichael S2013/07/05 06:41 AM
                                layer 2 cache behaviourEtienne2013/07/05 09:15 AM
                              layer 2 cache behaviourPatrick Chase2013/07/05 11:37 AM
                                layer 2 cache behaviourMichael S2013/07/06 10:57 AM
                                  layer 2 cache behaviourPatrick Chase2013/07/06 12:08 PM
                                    layer 2 cache behaviourPatrick Chase2013/07/06 12:19 PM
                                    layer 2 cache behaviourEtienne2013/07/08 03:10 AM
                                      layer 2 cache behaviourPatrick Chase2013/07/08 10:02 AM
                                  layer 2 cache behaviourPatrick Chase2013/07/06 02:15 PM
                                  layer 2 cache behaviourUngo2013/07/09 03:24 PM
                      No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 08:43 AM
                  No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 08:34 AM
                    No out-of-order in FP cluster of silvermont?anon2013/07/02 04:15 PM
            No out-of-order in FP cluster of silvermont?none2013/06/30 05:03 AM
              No out-of-order in FP cluster of silvermont?EduardoS2013/06/30 05:45 AM
                No out-of-order in FP cluster of silvermont?none2013/06/30 06:28 AM
                  No out-of-order in FP cluster of silvermont?EduardoS2013/06/30 01:27 PM
        No out-of-order in FP cluster of silvermont?x2013/06/30 03:54 AM
          No out-of-order in FP cluster of silvermont?Foo_2013/06/30 06:15 AM
        No out-of-order in FP cluster of silvermont?rwessel2013/06/30 10:11 PM
          No out-of-order in FP cluster of silvermont?Linus Torvalds2013/07/01 01:40 PM
            No out-of-order in FP cluster of silvermont?Patrick Chase2013/07/02 10:35 AM
              No out-of-order in FP cluster of silvermont?Linus Torvalds2013/07/02 11:18 AM
            FPU in integer codes2013/07/02 11:38 AM
              FPU in integer codesPatrick Chase2013/07/02 11:56 AM
              FPU in integer codesLinus Torvalds2013/07/02 12:12 PM
                FPU in integer codesPatrick Chase2013/07/02 12:34 PM
                  FPU in integer codesLinus Torvalds2013/07/02 01:55 PM
        No out-of-order in FP cluster of silvermont?2013/06/30 11:42 PM
          No out-of-order in FP cluster of silvermont?bakaneko2013/07/03 03:54 AM
        What about integer SIMD?Exophase2013/07/01 12:44 AM
          What about integer SIMD?anon2013/07/01 01:45 AM
            What about integer SIMD?Michael S2013/07/01 08:57 AM
              What about integer SIMD?rwessel2013/07/01 03:39 PM
                What about integer SIMD?Michael S2013/07/01 04:11 PM
                  What about integer SIMD?EduardoS2013/07/01 06:04 PM
                    What about integer SIMD?Michael S2013/07/02 12:32 AM
          What about integer SIMD?hi2013/07/01 08:15 AM
            What about integer SIMD?Exophase2013/07/01 10:50 AM
            What about integer SIMD?David Kanter2013/07/02 01:20 PM
              What about integer SIMD?hi2013/07/02 03:48 PM
                What about integer SIMD?David Kanter2013/07/04 03:19 PM
  Silvermont architecture in-depth articleSebastian Soeiro2013/07/30 09:34 AM
    TLBs are caches of page tablesPaul A. Clayton2013/07/30 11:03 AM
      TLBs are caches of page tablesSebastian Soeiro2013/07/30 01:18 PM
        TLBs are caches of page tablesPaul A. Clayton2013/07/30 03:59 PM
          TLBs are caches of page tablesSebastian Soeiro2013/07/30 05:27 PM
            TLBs are caches of page tablesrwessel2013/07/30 07:01 PM
              TLBs are caches of page tablesSebastian Soeiro2013/07/31 02:15 PM
                Floorplan images show physical locationsPaul A. Clayton2013/07/31 04:11 PM
                  Floorplan images show physical locationsSebastian Soeiro2013/07/31 09:12 PM
                    Floorplan images show physical locationsrwessel2013/08/01 12:21 AM
                      Floorplan images show physical locationsSebastian Soeiro2013/08/02 12:58 PM
                        Floorplan images show physical locationsAntti-Ville Tuunainen2013/08/02 02:09 PM
                        Floorplan images show physical locationsStubabe2013/08/02 07:49 PM
                          Floorplan images show physical locationsSebastian Soeiro2013/08/03 08:23 AM
                            Floorplan images show physical locationsrwessel2013/08/03 11:16 PM
                            Floorplan images show physical locationsMelody Speer2013/08/04 04:11 AM
                              Floorplan images show physical locationsSebastian Soeiro2013/08/04 05:42 PM
                                Floorplan images show physical locationsrwessel2013/08/04 10:58 PM
                                  Floorplan images show physical locationsSebastian Soeiro2013/08/07 03:33 PM
                                    Floorplan images show physical locationsrwessel2013/08/08 01:03 PM
                                      Floorplan images show physical locationsSebastian Soeiro2013/08/11 09:20 AM
                                        Page tables are set up by the OSPaul A. Clayton2013/08/11 01:25 PM
                                          Page tables are set up by the OSSebastian Soeiro2013/08/16 08:43 PM
                                            Multilevel page table formatPaul A. Clayton2013/08/17 11:18 AM
                                              Multilevel page table formatSebastian Soeiro2013/08/19 03:28 PM
                                                Multilevel page table formatrwessel2013/08/20 12:08 AM
                                                  Multilevel page table formatSebastian Soeiro2013/08/22 04:52 PM
                                                    Multilevel page table formatTREZA2013/08/22 05:30 PM
                                                    Multilevel page table formatrwessel2013/08/23 10:58 PM
                                                      Multilevel page table formatSebastian Soeiro2013/08/25 08:20 AM
                TLBs are caches of page tablesrwessel2013/08/01 12:41 AM
                  TLBs are caches of page tablesSebastian Soeiro2013/08/02 12:51 PM
                    TLBs are caches of page tablesrwessel2013/08/02 06:55 PM
  Silvermont instruction schedulingHugo Décharnes2013/10/02 03:25 AM
    Silvermont instruction schedulingMichael S2013/10/02 04:29 AM
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