diff for duplicates of <6A3DF150A5B70D4F9B66A25E3F7C888D070E17FA@039-SN2MPN1-013.039d.mgd.msft.net>
diff --git a/a/1.txt b/N1/1.txt
index d8446bb..e7387ec 100644
--- a/a/1.txt
+++ b/N1/1.txt
@@ -1,267 +1,184 @@
-
-
-> -----Original Message-----
-> From: Alexander Graf [mailto:agraf@suse.de]
-> Sent: Wednesday, July 24, 2013 1:55 PM
-> To: "“tiejun.chen”"
-> Cc: Bhushan Bharat-R65777; kvm-ppc@vger.kernel.org; kvm@vger.kernel.org list;
-> Wood Scott-B07421; Gleb Natapov; Paolo Bonzini
-> Subject: Re: [PATCH 2/2] kvm: powerpc: set cache coherency only for kernel
-> managed pages
->
->
-> On 24.07.2013, at 04:26, “tiejun.chen” wrote:
->
-> > On 07/18/2013 06:27 PM, Alexander Graf wrote:
-> >>
-> >> On 18.07.2013, at 12:19, “tiejun.chen” wrote:
-> >>
-> >>> On 07/18/2013 06:12 PM, Alexander Graf wrote:
-> >>>>
-> >>>> On 18.07.2013, at 12:08, “tiejun.chen” wrote:
-> >>>>
-> >>>>> On 07/18/2013 05:48 PM, Alexander Graf wrote:
-> >>>>>>
-> >>>>>> On 18.07.2013, at 10:25, Bhushan Bharat-R65777 wrote:
-> >>>>>>
-> >>>>>>>
-> >>>>>>>
-> >>>>>>>> -----Original Message-----
-> >>>>>>>> From: Bhushan Bharat-R65777
-> >>>>>>>> Sent: Thursday, July 18, 2013 1:53 PM
-> >>>>>>>> To: '" tiejun.chen "'
-> >>>>>>>> Cc: kvm-ppc@vger.kernel.org; kvm@vger.kernel.org;
-> >>>>>>>> agraf@suse.de; Wood Scott-
-> >>>>>>>> B07421
-> >>>>>>>> Subject: RE: [PATCH 2/2] kvm: powerpc: set cache coherency only
-> >>>>>>>> for kernel managed pages
-> >>>>>>>>
-> >>>>>>>>
-> >>>>>>>>
-> >>>>>>>>> -----Original Message-----
-> >>>>>>>>> From: " tiejun.chen " [mailto:tiejun.chen@windriver.com]
-> >>>>>>>>> Sent: Thursday, July 18, 2013 1:52 PM
-> >>>>>>>>> To: Bhushan Bharat-R65777
-> >>>>>>>>> Cc: kvm-ppc@vger.kernel.org; kvm@vger.kernel.org;
-> >>>>>>>>> agraf@suse.de; Wood
-> >>>>>>>>> Scott-
-> >>>>>>>>> B07421
-> >>>>>>>>> Subject: Re: [PATCH 2/2] kvm: powerpc: set cache coherency
-> >>>>>>>>> only for kernel managed pages
-> >>>>>>>>>
-> >>>>>>>>> On 07/18/2013 04:08 PM, Bhushan Bharat-R65777 wrote:
-> >>>>>>>>>>
-> >>>>>>>>>>
-> >>>>>>>>>>> -----Original Message-----
-> >>>>>>>>>>> From: kvm-ppc-owner@vger.kernel.org
-> >>>>>>>>>>> [mailto:kvm-ppc-owner@vger.kernel.org] On Behalf Of " tiejun.chen "
-> >>>>>>>>>>> Sent: Thursday, July 18, 2013 1:01 PM
-> >>>>>>>>>>> To: Bhushan Bharat-R65777
-> >>>>>>>>>>> Cc: kvm-ppc@vger.kernel.org; kvm@vger.kernel.org;
-> >>>>>>>>>>> agraf@suse.de; Wood
-> >>>>>>>>>>> Scott-
-> >>>>>>>>>>> B07421
-> >>>>>>>>>>> Subject: Re: [PATCH 2/2] kvm: powerpc: set cache coherency
-> >>>>>>>>>>> only for kernel managed pages
-> >>>>>>>>>>>
-> >>>>>>>>>>> On 07/18/2013 03:12 PM, Bhushan Bharat-R65777 wrote:
-> >>>>>>>>>>>>
-> >>>>>>>>>>>>
-> >>>>>>>>>>>>> -----Original Message-----
-> >>>>>>>>>>>>> From: " tiejun.chen " [mailto:tiejun.chen@windriver.com]
-> >>>>>>>>>>>>> Sent: Thursday, July 18, 2013 11:56 AM
-> >>>>>>>>>>>>> To: Bhushan Bharat-R65777
-> >>>>>>>>>>>>> Cc: kvm-ppc@vger.kernel.org; kvm@vger.kernel.org;
-> >>>>>>>>>>>>> agraf@suse.de; Wood
-> >>>>>>>>>>>>> Scott- B07421; Bhushan Bharat-R65777
-> >>>>>>>>>>>>> Subject: Re: [PATCH 2/2] kvm: powerpc: set cache coherency
-> >>>>>>>>>>>>> only for kernel managed pages
-> >>>>>>>>>>>>>
-> >>>>>>>>>>>>> On 07/18/2013 02:04 PM, Bharat Bhushan wrote:
-> >>>>>>>>>>>>>> If there is a struct page for the requested mapping then
-> >>>>>>>>>>>>>> it's normal DDR and the mapping sets "M" bit (coherent,
-> >>>>>>>>>>>>>> cacheable) else this is treated as I/O and we set "I +
-> >>>>>>>>>>>>>> G" (cache inhibited,
-> >>>>>>>>>>>>>> guarded)
-> >>>>>>>>>>>>>>
-> >>>>>>>>>>>>>> This helps setting proper TLB mapping for direct assigned
-> >>>>>>>>>>>>>> device
-> >>>>>>>>>>>>>>
-> >>>>>>>>>>>>>> Signed-off-by: Bharat Bhushan
-> >>>>>>>>>>>>>> <bharat.bhushan@freescale.com>
-> >>>>>>>>>>>>>> ---
-> >>>>>>>>>>>>>> arch/powerpc/kvm/e500_mmu_host.c | 17 ++++++++++++-----
-> >>>>>>>>>>>>>> 1 files changed, 12 insertions(+), 5 deletions(-)
-> >>>>>>>>>>>>>>
-> >>>>>>>>>>>>>> diff --git a/arch/powerpc/kvm/e500_mmu_host.c
-> >>>>>>>>>>>>>> b/arch/powerpc/kvm/e500_mmu_host.c
-> >>>>>>>>>>>>>> index 1c6a9d7..089c227 100644
-> >>>>>>>>>>>>>> --- a/arch/powerpc/kvm/e500_mmu_host.c
-> >>>>>>>>>>>>>> +++ b/arch/powerpc/kvm/e500_mmu_host.c
-> >>>>>>>>>>>>>> @@ -64,13 +64,20 @@ static inline u32
-> >>>>>>>>>>>>>> e500_shadow_mas3_attrib(u32 mas3, int
-> >>>>>>>>>>>>> usermode)
-> >>>>>>>>>>>>>> return mas3;
-> >>>>>>>>>>>>>> }
-> >>>>>>>>>>>>>>
-> >>>>>>>>>>>>>> -static inline u32 e500_shadow_mas2_attrib(u32 mas2, int
-> >>>>>>>>>>>>>> usermode)
-> >>>>>>>>>>>>>> +static inline u32 e500_shadow_mas2_attrib(u32 mas2,
-> >>>>>>>>>>>>>> +pfn_t pfn)
-> >>>>>>>>>>>>>> {
-> >>>>>>>>>>>>>> + u32 mas2_attr;
-> >>>>>>>>>>>>>> +
-> >>>>>>>>>>>>>> + mas2_attr = mas2 & MAS2_ATTRIB_MASK;
-> >>>>>>>>>>>>>> +
-> >>>>>>>>>>>>>> + if (!pfn_valid(pfn)) {
-> >>>>>>>>>>>>>
-> >>>>>>>>>>>>> Why not directly use kvm_is_mmio_pfn()?
-> >>>>>>>>>>>>
-> >>>>>>>>>>>> What I understand from this function (someone can correct
-> >>>>>>>>>>>> me) is that it
-> >>>>>>>>>>> returns "false" when the page is managed by kernel and is
-> >>>>>>>>>>> not marked as RESERVED (for some reason). For us it does not
-> >>>>>>>>>>> matter whether the page is reserved or not, if it is kernel
-> >>>>>>>>>>> visible page then it
-> >>>>>>>> is DDR.
-> >>>>>>>>>>>>
-> >>>>>>>>>>>
-> >>>>>>>>>>> I think you are setting I|G by addressing all mmio pages,
-> >>>>>>>>>>> right? If so,
-> >>>>>>>>>>>
-> >>>>>>>>>>> KVM: direct mmio pfn check
-> >>>>>>>>>>>
-> >>>>>>>>>>> Userspace may specify memory slots that are backed by
-> >>>>>>>>>>> mmio pages rather than
-> >>>>>>>>>>> normal RAM. In some cases it is not enough to identify
-> >>>>>>>>>>> these mmio
-> >>>>>>>>> pages
-> >>>>>>>>>>> by pfn_valid(). This patch adds checking the PageReserved as
-> well.
-> >>>>>>>>>>
-> >>>>>>>>>> Do you know what are those "some cases" and how checking
-> >>>>>>>>>> PageReserved helps in
-> >>>>>>>>> those cases?
-> >>>>>>>>>
-> >>>>>>>>> No, myself didn't see these actual cases in qemu,too. But this
-> >>>>>>>>> should be chronically persistent as I understand ;-)
-> >>>>>>>>
-> >>>>>>>> Then I will wait till someone educate me :)
-> >>>>>>>
-> >>>>>>> The reason is , kvm_is_mmio_pfn() function looks pretty heavy and I do
-> not want to call this for all tlbwe operation unless it is necessary.
-> >>>>>>
-> >>>>>> It certainly does more than we need and potentially slows down the fast
-> path (RAM mapping). The only thing it does on top of "if (pfn_valid())" is to
-> check for pages that are declared reserved on the host. This happens in 2 cases:
-> >>>>>>
-> >>>>>> 1) Non cache coherent DMA
-> >>>>>> 2) Memory hot remove
-> >>>>>>
-> >>>>>> The non coherent DMA case would be interesting, as with the mechanism as
-> it is in place in Linux today, we could potentially break normal guest operation
-> if we don't take it into account. However, it's Kconfig guarded by:
-> >>>>>>
-> >>>>>> depends on 4xx || 8xx || E200 || PPC_MPC512x || GAMECUBE_COMMON
-> >>>>>> default n if PPC_47x
-> >>>>>> default y
-> >>>>>>
-> >>>>>> so we never hit it with any core we care about ;).
-> >>>>>>
-> >>>>>> Memory hot remove does not exist on e500 FWIW, so we don't have to worry
-> about that one either.
-> >>>>>
-> >>>>> Thanks for this good information :)
-> >>>>>
-> >>>>> So why not limit those codes with CONFIG_MEMORY_HOTPLUG inside
-> kvm_is_mmio_pfn() to make sure that check is only valid when that is really
-> needed? This can decrease those unnecessary performance loss.
-> >>>>>
-> >>>>> If I'm wrong please correct me :)
-> >>>>
-> >>>> You're perfectly right, but this is generic KVM code. So it gets run across
-> all architectures. What if someone has the great idea to add a new case here for
-> x86, but doesn't tell us? In that case we potentially break x86.
-> >>>>
-> >>>> I'd rather not like to break x86 :).
-> >>>>
-> >>>> However, it'd be very interesting to see a benchmark with this change. Do
-> you think you could just rip out the whole reserved check and run a few
-> benchmarks and show us the results?
-> >>>>
-> >>>
-> >>> Often what case should be adopted to validate this scenario?
-> >>
-> >> Something which hammers the TLB emulation heavily. I usually just run
-> >> /bin/echo a thousand times in "time" and see how long it takes ;)
-> >>
-> >
-> > I tried to run five times with this combination, "time `for ((i=0; i<5000;
-> i++)); do /bin/echo; done`", to calculate the average value with this change:
-> >
-> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index
-> > 1580dd4..5e8635b 100644
-> > --- a/virt/kvm/kvm_main.c
-> > +++ b/virt/kvm/kvm_main.c
-> > @@ -102,6 +102,10 @@ static bool largepages_enabled = true;
-> >
-> > bool kvm_is_mmio_pfn(pfn_t pfn)
-> > {
-> > +#ifdef CONFIG_MEMORY_HOTPLUG
->
-> I'd feel safer if we narrow this down to e500.
->
-> > + /*
-> > + * Currently only in memory hot remove case we may still need this.
-> > + */
-> > if (pfn_valid(pfn)) {
->
-> We still have to check for pfn_valid, no? So the #ifdef should be down here.
->
-> > int reserved;
-> > struct page *tail = pfn_to_page(pfn); @@ -124,6 +128,7
-> > @@ bool kvm_is_mmio_pfn(pfn_t pfn)
-> > }
-> > return PageReserved(tail);
-> > }
-> > +#endif
-> >
-> > return true;
-> > }
-> >
-> > Before apply this change:
-> >
-> > real (1m19.954s + 1m20.918s + 1m22.740s + 1m21.146s + 1m22.120s)/5=
-> 1m21.376s
-> > user (0m23.181s + 0m23.550s + 0m23.506s + 0m23.410s + 0m23.520s)/5=
-> 0m23.433s
-> > sys (0m49.087s + 0m49.563s + 0m51.758s + 0m50.290s + 0m51.047s)/5= 0m50.349s
-> >
-> > After apply this change:
-> >
-> > real (1m19.507s + 1m20.919s + 1m21.436s + 1m21.179s + 1m20.293s)/5=
-> 1m20.667s
-> > user (0m22.595s + 0m22.719s + 0m22.484s + 0m22.811s + 0m22.467s)/5=
-> 0m22.615s
-> > sys (0m48.841s + 0m49.929s + 0m50.310s + 0m49.813s + 0m48.587s)/5= 0m49.496s
-> >
-> > So,
-> >
-> > real (1m20.667s - 1m21.376s)/1m21.376s x 100% = -0.6%
-> > user (0m22.615s - 0m23.433s)/0m23.433s x 100% = -3.5%
-> > sys (0m49.496s - 0m50.349s)/0m50.349s x 100% = -1.7%
->
-> Very nice, so there is a real world performance benefit to doing this. Then yes,
-> I think it would make sense to change the global helper function to be fast on
-> e500 and use that one from e500_shadow_mas2_attrib() instead.
-
-Are not we going to use page_is_ram() from e500_shadow_mas2_attrib() as Scott commented?
-
--Bharat
-
->
-> Gleb, Paolo, any hard feelings?
->
->
-> Alex
->
\ No newline at end of file
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\ No newline at end of file
diff --git a/a/content_digest b/N1/content_digest
index 9d2dd46..7d2aad8 100644
--- a/a/content_digest
+++ b/N1/content_digest
@@ -70,273 +70,190 @@
"b\0"
]
[
- "\n",
- "\n",
- "> -----Original Message-----\n",
- "> From: Alexander Graf [mailto:agraf\@suse.de]\n",
- "> Sent: Wednesday, July 24, 2013 1:55 PM\n",
- "> To: \"\342\200\234tiejun.chen\342\200\235\"\n",
- "> Cc: Bhushan Bharat-R65777; kvm-ppc\@vger.kernel.org; kvm\@vger.kernel.org list;\n",
- "> Wood Scott-B07421; Gleb Natapov; Paolo Bonzini\n",
- "> Subject: Re: [PATCH 2/2] kvm: powerpc: set cache coherency only for kernel\n",
- "> managed pages\n",
- "> \n",
- "> \n",
- "> On 24.07.2013, at 04:26, \342\200\234tiejun.chen\342\200\235 wrote:\n",
- "> \n",
- "> > On 07/18/2013 06:27 PM, Alexander Graf wrote:\n",
- "> >>\n",
- "> >> On 18.07.2013, at 12:19, \342\200\234tiejun.chen\342\200\235 wrote:\n",
- "> >>\n",
- "> >>> On 07/18/2013 06:12 PM, Alexander Graf wrote:\n",
- "> >>>>\n",
- "> >>>> On 18.07.2013, at 12:08, \342\200\234tiejun.chen\342\200\235 wrote:\n",
- "> >>>>\n",
- "> >>>>> On 07/18/2013 05:48 PM, Alexander Graf wrote:\n",
- "> >>>>>>\n",
- "> >>>>>> On 18.07.2013, at 10:25, Bhushan Bharat-R65777 wrote:\n",
- "> >>>>>>\n",
- "> >>>>>>>\n",
- "> >>>>>>>\n",
- "> >>>>>>>> -----Original Message-----\n",
- "> >>>>>>>> From: Bhushan Bharat-R65777\n",
- "> >>>>>>>> Sent: Thursday, July 18, 2013 1:53 PM\n",
- "> >>>>>>>> To: '\" tiejun.chen \"'\n",
- "> >>>>>>>> Cc: kvm-ppc\@vger.kernel.org; kvm\@vger.kernel.org;\n",
- "> >>>>>>>> agraf\@suse.de; Wood Scott-\n",
- "> >>>>>>>> B07421\n",
- "> >>>>>>>> Subject: RE: [PATCH 2/2] kvm: powerpc: set cache coherency only\n",
- "> >>>>>>>> for kernel managed pages\n",
- "> >>>>>>>>\n",
- "> >>>>>>>>\n",
- "> >>>>>>>>\n",
- "> >>>>>>>>> -----Original Message-----\n",
- "> >>>>>>>>> From: \" tiejun.chen \" [mailto:tiejun.chen\@windriver.com]\n",
- "> >>>>>>>>> Sent: Thursday, July 18, 2013 1:52 PM\n",
- "> >>>>>>>>> To: Bhushan Bharat-R65777\n",
- "> >>>>>>>>> Cc: kvm-ppc\@vger.kernel.org; kvm\@vger.kernel.org;\n",
- "> >>>>>>>>> agraf\@suse.de; Wood\n",
- "> >>>>>>>>> Scott-\n",
- "> >>>>>>>>> B07421\n",
- "> >>>>>>>>> Subject: Re: [PATCH 2/2] kvm: powerpc: set cache coherency\n",
- "> >>>>>>>>> only for kernel managed pages\n",
- "> >>>>>>>>>\n",
- "> >>>>>>>>> On 07/18/2013 04:08 PM, Bhushan Bharat-R65777 wrote:\n",
- "> >>>>>>>>>>\n",
- "> >>>>>>>>>>\n",
- "> >>>>>>>>>>> -----Original Message-----\n",
- "> >>>>>>>>>>> From: kvm-ppc-owner\@vger.kernel.org\n",
- "> >>>>>>>>>>> [mailto:kvm-ppc-owner\@vger.kernel.org] On Behalf Of \" tiejun.chen \"\n",
- "> >>>>>>>>>>> Sent: Thursday, July 18, 2013 1:01 PM\n",
- "> >>>>>>>>>>> To: Bhushan Bharat-R65777\n",
- "> >>>>>>>>>>> Cc: kvm-ppc\@vger.kernel.org; kvm\@vger.kernel.org;\n",
- "> >>>>>>>>>>> agraf\@suse.de; Wood\n",
- "> >>>>>>>>>>> Scott-\n",
- "> >>>>>>>>>>> B07421\n",
- "> >>>>>>>>>>> Subject: Re: [PATCH 2/2] kvm: powerpc: set cache coherency\n",
- "> >>>>>>>>>>> only for kernel managed pages\n",
- "> >>>>>>>>>>>\n",
- "> >>>>>>>>>>> On 07/18/2013 03:12 PM, Bhushan Bharat-R65777 wrote:\n",
- "> >>>>>>>>>>>>\n",
- "> >>>>>>>>>>>>\n",
- "> >>>>>>>>>>>>> -----Original Message-----\n",
- "> >>>>>>>>>>>>> From: \" tiejun.chen \" [mailto:tiejun.chen\@windriver.com]\n",
- "> >>>>>>>>>>>>> Sent: Thursday, July 18, 2013 11:56 AM\n",
- "> >>>>>>>>>>>>> To: Bhushan Bharat-R65777\n",
- "> >>>>>>>>>>>>> Cc: kvm-ppc\@vger.kernel.org; kvm\@vger.kernel.org;\n",
- "> >>>>>>>>>>>>> agraf\@suse.de; Wood\n",
- "> >>>>>>>>>>>>> Scott- B07421; Bhushan Bharat-R65777\n",
- "> >>>>>>>>>>>>> Subject: Re: [PATCH 2/2] kvm: powerpc: set cache coherency\n",
- "> >>>>>>>>>>>>> only for kernel managed pages\n",
- "> >>>>>>>>>>>>>\n",
- "> >>>>>>>>>>>>> On 07/18/2013 02:04 PM, Bharat Bhushan wrote:\n",
- "> >>>>>>>>>>>>>> If there is a struct page for the requested mapping then\n",
- "> >>>>>>>>>>>>>> it's normal DDR and the mapping sets \"M\" bit (coherent,\n",
- "> >>>>>>>>>>>>>> cacheable) else this is treated as I/O and we set \"I +\n",
- "> >>>>>>>>>>>>>> G\" (cache inhibited,\n",
- "> >>>>>>>>>>>>>> guarded)\n",
- "> >>>>>>>>>>>>>>\n",
- "> >>>>>>>>>>>>>> This helps setting proper TLB mapping for direct assigned\n",
- "> >>>>>>>>>>>>>> device\n",
- "> >>>>>>>>>>>>>>\n",
- "> >>>>>>>>>>>>>> Signed-off-by: Bharat Bhushan\n",
- "> >>>>>>>>>>>>>> <bharat.bhushan\@freescale.com>\n",
- "> >>>>>>>>>>>>>> ---\n",
- "> >>>>>>>>>>>>>> arch/powerpc/kvm/e500_mmu_host.c | 17 ++++++++++++-----\n",
- "> >>>>>>>>>>>>>> 1 files changed, 12 insertions(+), 5 deletions(-)\n",
- "> >>>>>>>>>>>>>>\n",
- "> >>>>>>>>>>>>>> diff --git a/arch/powerpc/kvm/e500_mmu_host.c\n",
- "> >>>>>>>>>>>>>> b/arch/powerpc/kvm/e500_mmu_host.c\n",
- "> >>>>>>>>>>>>>> index 1c6a9d7..089c227 100644\n",
- "> >>>>>>>>>>>>>> --- a/arch/powerpc/kvm/e500_mmu_host.c\n",
- "> >>>>>>>>>>>>>> +++ b/arch/powerpc/kvm/e500_mmu_host.c\n",
- "> >>>>>>>>>>>>>> \@\@ -64,13 +64,20 \@\@ static inline u32\n",
- "> >>>>>>>>>>>>>> e500_shadow_mas3_attrib(u32 mas3, int\n",
- "> >>>>>>>>>>>>> usermode)\n",
- "> >>>>>>>>>>>>>> \treturn mas3;\n",
- "> >>>>>>>>>>>>>> }\n",
- "> >>>>>>>>>>>>>>\n",
- "> >>>>>>>>>>>>>> -static inline u32 e500_shadow_mas2_attrib(u32 mas2, int\n",
- "> >>>>>>>>>>>>>> usermode)\n",
- "> >>>>>>>>>>>>>> +static inline u32 e500_shadow_mas2_attrib(u32 mas2,\n",
- "> >>>>>>>>>>>>>> +pfn_t pfn)\n",
- "> >>>>>>>>>>>>>> {\n",
- "> >>>>>>>>>>>>>> +\tu32 mas2_attr;\n",
- "> >>>>>>>>>>>>>> +\n",
- "> >>>>>>>>>>>>>> +\tmas2_attr = mas2 & MAS2_ATTRIB_MASK;\n",
- "> >>>>>>>>>>>>>> +\n",
- "> >>>>>>>>>>>>>> +\tif (!pfn_valid(pfn)) {\n",
- "> >>>>>>>>>>>>>\n",
- "> >>>>>>>>>>>>> Why not directly use kvm_is_mmio_pfn()?\n",
- "> >>>>>>>>>>>>\n",
- "> >>>>>>>>>>>> What I understand from this function (someone can correct\n",
- "> >>>>>>>>>>>> me) is that it\n",
- "> >>>>>>>>>>> returns \"false\" when the page is managed by kernel and is\n",
- "> >>>>>>>>>>> not marked as RESERVED (for some reason). For us it does not\n",
- "> >>>>>>>>>>> matter whether the page is reserved or not, if it is kernel\n",
- "> >>>>>>>>>>> visible page then it\n",
- "> >>>>>>>> is DDR.\n",
- "> >>>>>>>>>>>>\n",
- "> >>>>>>>>>>>\n",
- "> >>>>>>>>>>> I think you are setting I|G by addressing all mmio pages,\n",
- "> >>>>>>>>>>> right? If so,\n",
- "> >>>>>>>>>>>\n",
- "> >>>>>>>>>>> KVM: direct mmio pfn check\n",
- "> >>>>>>>>>>>\n",
- "> >>>>>>>>>>> Userspace may specify memory slots that are backed by\n",
- "> >>>>>>>>>>> mmio pages rather than\n",
- "> >>>>>>>>>>> normal RAM. In some cases it is not enough to identify\n",
- "> >>>>>>>>>>> these mmio\n",
- "> >>>>>>>>> pages\n",
- "> >>>>>>>>>>> by pfn_valid(). This patch adds checking the PageReserved as\n",
- "> well.\n",
- "> >>>>>>>>>>\n",
- "> >>>>>>>>>> Do you know what are those \"some cases\" and how checking\n",
- "> >>>>>>>>>> PageReserved helps in\n",
- "> >>>>>>>>> those cases?\n",
- "> >>>>>>>>>\n",
- "> >>>>>>>>> No, myself didn't see these actual cases in qemu,too. But this\n",
- "> >>>>>>>>> should be chronically persistent as I understand ;-)\n",
- "> >>>>>>>>\n",
- "> >>>>>>>> Then I will wait till someone educate me :)\n",
- "> >>>>>>>\n",
- "> >>>>>>> The reason is , kvm_is_mmio_pfn() function looks pretty heavy and I do\n",
- "> not want to call this for all tlbwe operation unless it is necessary.\n",
- "> >>>>>>\n",
- "> >>>>>> It certainly does more than we need and potentially slows down the fast\n",
- "> path (RAM mapping). The only thing it does on top of \"if (pfn_valid())\" is to\n",
- "> check for pages that are declared reserved on the host. This happens in 2 cases:\n",
- "> >>>>>>\n",
- "> >>>>>> 1) Non cache coherent DMA\n",
- "> >>>>>> 2) Memory hot remove\n",
- "> >>>>>>\n",
- "> >>>>>> The non coherent DMA case would be interesting, as with the mechanism as\n",
- "> it is in place in Linux today, we could potentially break normal guest operation\n",
- "> if we don't take it into account. However, it's Kconfig guarded by:\n",
- "> >>>>>>\n",
- "> >>>>>> depends on 4xx || 8xx || E200 || PPC_MPC512x || GAMECUBE_COMMON\n",
- "> >>>>>> default n if PPC_47x\n",
- "> >>>>>> default y\n",
- "> >>>>>>\n",
- "> >>>>>> so we never hit it with any core we care about ;).\n",
- "> >>>>>>\n",
- "> >>>>>> Memory hot remove does not exist on e500 FWIW, so we don't have to worry\n",
- "> about that one either.\n",
- "> >>>>>\n",
- "> >>>>> Thanks for this good information :)\n",
- "> >>>>>\n",
- "> >>>>> So why not limit those codes with CONFIG_MEMORY_HOTPLUG inside\n",
- "> kvm_is_mmio_pfn() to make sure that check is only valid when that is really\n",
- "> needed? This can decrease those unnecessary performance loss.\n",
- "> >>>>>\n",
- "> >>>>> If I'm wrong please correct me :)\n",
- "> >>>>\n",
- "> >>>> You're perfectly right, but this is generic KVM code. So it gets run across\n",
- "> all architectures. What if someone has the great idea to add a new case here for\n",
- "> x86, but doesn't tell us? In that case we potentially break x86.\n",
- "> >>>>\n",
- "> >>>> I'd rather not like to break x86 :).\n",
- "> >>>>\n",
- "> >>>> However, it'd be very interesting to see a benchmark with this change. Do\n",
- "> you think you could just rip out the whole reserved check and run a few\n",
- "> benchmarks and show us the results?\n",
- "> >>>>\n",
- "> >>>\n",
- "> >>> Often what case should be adopted to validate this scenario?\n",
- "> >>\n",
- "> >> Something which hammers the TLB emulation heavily. I usually just run\n",
- "> >> /bin/echo a thousand times in \"time\" and see how long it takes ;)\n",
- "> >>\n",
- "> >\n",
- "> > I tried to run five times with this combination, \"time `for ((i=0; i<5000;\n",
- "> i++)); do /bin/echo; done`\", to calculate the average value with this change:\n",
- "> >\n",
- "> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index\n",
- "> > 1580dd4..5e8635b 100644\n",
- "> > --- a/virt/kvm/kvm_main.c\n",
- "> > +++ b/virt/kvm/kvm_main.c\n",
- "> > \@\@ -102,6 +102,10 \@\@ static bool largepages_enabled = true;\n",
- "> >\n",
- "> > bool kvm_is_mmio_pfn(pfn_t pfn)\n",
- "> > {\n",
- "> > +#ifdef CONFIG_MEMORY_HOTPLUG\n",
- "> \n",
- "> I'd feel safer if we narrow this down to e500.\n",
- "> \n",
- "> > + /*\n",
- "> > + * Currently only in memory hot remove case we may still need this.\n",
- "> > + */\n",
- "> > if (pfn_valid(pfn)) {\n",
- "> \n",
- "> We still have to check for pfn_valid, no? So the #ifdef should be down here.\n",
- "> \n",
- "> > int reserved;\n",
- "> > struct page *tail = pfn_to_page(pfn); \@\@ -124,6 +128,7\n",
- "> > \@\@ bool kvm_is_mmio_pfn(pfn_t pfn)\n",
- "> > }\n",
- "> > return PageReserved(tail);\n",
- "> > }\n",
- "> > +#endif\n",
- "> >\n",
- "> > return true;\n",
- "> > }\n",
- "> >\n",
- "> > Before apply this change:\n",
- "> >\n",
- "> > real (1m19.954s + 1m20.918s + 1m22.740s + 1m21.146s + 1m22.120s)/5=\n",
- "> 1m21.376s\n",
- "> > user (0m23.181s + 0m23.550s + 0m23.506s + 0m23.410s + 0m23.520s)/5=\n",
- "> 0m23.433s\n",
- "> > sys\t(0m49.087s + 0m49.563s + 0m51.758s + 0m50.290s + 0m51.047s)/5= 0m50.349s\n",
- "> >\n",
- "> > After apply this change:\n",
- "> >\n",
- "> > real (1m19.507s + 1m20.919s + 1m21.436s + 1m21.179s + 1m20.293s)/5=\n",
- "> 1m20.667s\n",
- "> > user (0m22.595s + 0m22.719s + 0m22.484s + 0m22.811s + 0m22.467s)/5=\n",
- "> 0m22.615s\n",
- "> > sys\t(0m48.841s + 0m49.929s + 0m50.310s + 0m49.813s + 0m48.587s)/5= 0m49.496s\n",
- "> >\n",
- "> > So,\n",
- "> >\n",
- "> > real (1m20.667s - 1m21.376s)/1m21.376s x 100% = -0.6%\n",
- "> > user (0m22.615s - 0m23.433s)/0m23.433s x 100% = -3.5%\n",
- "> > sys\t(0m49.496s - 0m50.349s)/0m50.349s x 100% = -1.7%\n",
- "> \n",
- "> Very nice, so there is a real world performance benefit to doing this. Then yes,\n",
- "> I think it would make sense to change the global helper function to be fast on\n",
- "> e500 and use that one from e500_shadow_mas2_attrib() instead.\n",
- "\n",
- "Are not we going to use page_is_ram() from e500_shadow_mas2_attrib() as Scott commented?\n",
- "\n",
- "-Bharat\n",
- "\n",
- "> \n",
- "> Gleb, Paolo, any hard feelings?\n",
- "> \n",
- "> \n",
- "> Alex\n",
- ">"
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-64f9f815a5c0e55773706ef08ce28f8e0e78bbfb5ee0b386aedd61ddbeaa657b
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This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.