CpuInfo.First stores whether the current thread belongs to the first
package in the platform, first core in a package, first thread in a
core.
But the time complexity of original algorithm to calculate the
CpuInfo.First is O (n) * O (p) * O (c).
n: number of processors
p: number of packages
c: number of cores per package
The patch trades time with space by storing the first package, first
core per package, first thread per core in an array.
The time complexity becomes O (n).
Signed-off-by: Ray Ni <ray.ni@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Yun Lou <yun.lou@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
---
.../CpuFeaturesInitialize.c | 96 +++++++++----------
1 file changed, 47 insertions(+), 49 deletions(-)
diff --git a/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c b/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c
index d4a576385f..a1e972b1a2 100644
--- a/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c
+++ b/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c
@@ -105,7 +105,10 @@ CpuInitDataInitialize (
EFI_CPU_PHYSICAL_LOCATION *Location;
UINT32 PackageIndex;
UINT32 CoreIndex;
- UINT32 First;
+ UINTN Pages;
+ UINT32 FirstPackage;
+ UINT32 *FirstCore;
+ UINT32 *FirstThread;
ACPI_CPU_DATA *AcpiCpuData;
CPU_STATUS_INFORMATION *CpuStatus;
UINT32 *ThreadCountPerPackage;
@@ -236,74 +239,69 @@ CpuInitDataInitialize (
//
// Initialize CpuFeaturesData->InitOrder[].CpuInfo.First
+ // Use AllocatePages () instead of AllocatePool () because pool cannot be freed in PEI phase but page can.
//
+ Pages = EFI_SIZE_TO_PAGES (CpuStatus->PackageCount * sizeof (UINT32) + CpuStatus->PackageCount * CpuStatus->MaxCoreCount * sizeof (UINT32));
+ FirstCore = AllocatePages (Pages);
+ ASSERT (FirstCore != NULL);
+ FirstThread = FirstCore + CpuStatus->PackageCount;
//
- // Set First.Package for each thread belonging to the first package.
+ // Set FirstPackage, FirstCore[], FirstThread[] to maximum package ID, core ID, thread ID.
//
- First = MAX_UINT32;
+ FirstPackage = MAX_UINT32;
+ SetMem32 (FirstCore, CpuStatus->PackageCount * sizeof (UINT32), MAX_UINT32);
+ SetMem32 (FirstThread, CpuStatus->PackageCount * CpuStatus->MaxCoreCount * sizeof (UINT32), MAX_UINT32);
+
for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {
Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;
- First = MIN (Location->Package, First);
+
+ //
+ // Save the minimum package ID in the platform.
+ //
+ FirstPackage = MIN (Location->Package, FirstPackage);
+
+ //
+ // Save the minimum core ID per package.
+ //
+ FirstCore[Location->Package] = MIN (Location->Core, FirstCore[Location->Package]);
+
+ //
+ // Save the minimum thread ID per core.
+ //
+ FirstThread[Location->Package * CpuStatus->MaxCoreCount + Location->Core] = MIN (
+ Location->Thread,
+ FirstThread[Location->Package * CpuStatus->MaxCoreCount + Location->Core]
+ );
}
+
+ //
+ // Update the First field.
+ //
for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {
Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;
- if (Location->Package == First) {
+
+ if (Location->Package == FirstPackage) {
CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Package = 1;
}
- }
- //
- // Set First.Die/Tile/Module for each thread assuming:
- // single Die under each package, single Tile under each Die, single Module under each Tile
- //
- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {
+ //
+ // Set First.Die/Tile/Module for each thread assuming:
+ // single Die under each package, single Tile under each Die, single Module under each Tile
+ //
CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Die = 1;
CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Tile = 1;
CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Module = 1;
- }
- for (PackageIndex = 0; PackageIndex < CpuStatus->PackageCount; PackageIndex++) {
- //
- // Set First.Core for each thread in the first core of each package.
- //
- First = MAX_UINT32;
- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {
- Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;
- if (Location->Package == PackageIndex) {
- First = MIN (Location->Core, First);
- }
+ if (Location->Core == FirstCore[Location->Package]) {
+ CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Core = 1;
}
-
- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {
- Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;
- if (Location->Package == PackageIndex && Location->Core == First) {
- CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Core = 1;
- }
+ if (Location->Thread == FirstThread[Location->Package * CpuStatus->MaxCoreCount + Location->Core]) {
+ CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Thread = 1;
}
}
- for (PackageIndex = 0; PackageIndex < CpuStatus->PackageCount; PackageIndex++) {
- for (CoreIndex = 0; CoreIndex < CpuStatus->MaxCoreCount; CoreIndex++) {
- //
- // Set First.Thread for the first thread of each core.
- //
- First = MAX_UINT32;
- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {
- Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;
- if (Location->Package == PackageIndex && Location->Core == CoreIndex) {
- First = MIN (Location->Thread, First);
- }
- }
-
- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {
- Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;
- if (Location->Package == PackageIndex && Location->Core == CoreIndex && Location->Thread == First) {
- CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Thread = 1;
- }
- }
- }
- }
+ FreePages (FirstCore, Pages);
}
/**
--
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Reviewed-by: Eric Dong <eric.dong@intel.com>
-----Original Message-----
From: Ni, Ray <ray.ni@intel.com>
Sent: Friday, December 11, 2020 6:48 PM
To: devel@edk2.groups.io
Cc: Dong, Eric <eric.dong@intel.com>; Zeng, Star <star.zeng@intel.com>; Lou, Yun <yun.lou@intel.com>; Laszlo Ersek <lersek@redhat.com>
Subject: [PATCH V2] UefiCpuPkg/CpuFeature: reduce time complexty to calc CpuInfo.First
CpuInfo.First stores whether the current thread belongs to the first package in the platform, first core in a package, first thread in a core.
But the time complexity of original algorithm to calculate the CpuInfo.First is O (n) * O (p) * O (c).
n: number of processors
p: number of packages
c: number of cores per package
The patch trades time with space by storing the first package, first core per package, first thread per core in an array.
The time complexity becomes O (n).
Signed-off-by: Ray Ni <ray.ni@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Yun Lou <yun.lou@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
---
.../CpuFeaturesInitialize.c | 96 +++++++++----------
1 file changed, 47 insertions(+), 49 deletions(-)
diff --git a/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c b/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c
index d4a576385f..a1e972b1a2 100644
--- a/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c
+++ b/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c
@@ -105,7 +105,10 @@ CpuInitDataInitialize (
EFI_CPU_PHYSICAL_LOCATION *Location; UINT32 PackageIndex; UINT32 CoreIndex;- UINT32 First;+ UINTN Pages;+ UINT32 FirstPackage;+ UINT32 *FirstCore;+ UINT32 *FirstThread; ACPI_CPU_DATA *AcpiCpuData; CPU_STATUS_INFORMATION *CpuStatus; UINT32 *ThreadCountPerPackage;@@ -236,74 +239,69 @@ CpuInitDataInitialize (
// // Initialize CpuFeaturesData->InitOrder[].CpuInfo.First+ // Use AllocatePages () instead of AllocatePool () because pool cannot be freed in PEI phase but page can. //+ Pages = EFI_SIZE_TO_PAGES (CpuStatus->PackageCount * sizeof (UINT32) + CpuStatus->PackageCount * CpuStatus->MaxCoreCount * sizeof (UINT32));+ FirstCore = AllocatePages (Pages);+ ASSERT (FirstCore != NULL);+ FirstThread = FirstCore + CpuStatus->PackageCount; //- // Set First.Package for each thread belonging to the first package.+ // Set FirstPackage, FirstCore[], FirstThread[] to maximum package ID, core ID, thread ID. //- First = MAX_UINT32;+ FirstPackage = MAX_UINT32;+ SetMem32 (FirstCore, CpuStatus->PackageCount * sizeof (UINT32), MAX_UINT32);+ SetMem32 (FirstThread, CpuStatus->PackageCount * CpuStatus->MaxCoreCount * sizeof (UINT32), MAX_UINT32);+ for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) { Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;- First = MIN (Location->Package, First);++ //+ // Save the minimum package ID in the platform.+ //+ FirstPackage = MIN (Location->Package, FirstPackage);+ + //+ // Save the minimum core ID per package.+ //+ FirstCore[Location->Package] = MIN (Location->Core, FirstCore[Location->Package]);+ + //+ // Save the minimum thread ID per core.+ //+ FirstThread[Location->Package * CpuStatus->MaxCoreCount + Location->Core] = MIN (+ Location->Thread,+ FirstThread[Location->Package * CpuStatus->MaxCoreCount + Location->Core]+ ); }++ //+ // Update the First field.+ // for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) { Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;- if (Location->Package == First) {++ if (Location->Package == FirstPackage) { CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Package = 1; }- } - //- // Set First.Die/Tile/Module for each thread assuming:- // single Die under each package, single Tile under each Die, single Module under each Tile- //- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {+ //+ // Set First.Die/Tile/Module for each thread assuming:+ // single Die under each package, single Tile under each Die, single Module under each Tile+ // CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Die = 1; CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Tile = 1; CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Module = 1;- } - for (PackageIndex = 0; PackageIndex < CpuStatus->PackageCount; PackageIndex++) {- //- // Set First.Core for each thread in the first core of each package.- //- First = MAX_UINT32;- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {- Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;- if (Location->Package == PackageIndex) {- First = MIN (Location->Core, First);- }+ if (Location->Core == FirstCore[Location->Package]) {+ CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Core = 1; }-- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {- Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;- if (Location->Package == PackageIndex && Location->Core == First) {- CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Core = 1;- }+ if (Location->Thread == FirstThread[Location->Package * CpuStatus->MaxCoreCount + Location->Core]) {+ CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Thread = 1; } } - for (PackageIndex = 0; PackageIndex < CpuStatus->PackageCount; PackageIndex++) {- for (CoreIndex = 0; CoreIndex < CpuStatus->MaxCoreCount; CoreIndex++) {- //- // Set First.Thread for the first thread of each core.- //- First = MAX_UINT32;- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {- Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;- if (Location->Package == PackageIndex && Location->Core == CoreIndex) {- First = MIN (Location->Thread, First);- }- }-- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {- Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;- if (Location->Package == PackageIndex && Location->Core == CoreIndex && Location->Thread == First) {- CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Thread = 1;- }- }- }- }+ FreePages (FirstCore, Pages); } /**--
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Reviewed-by: Star Zeng <star.zeng@intel.com>
-----Original Message-----
From: Dong, Eric <eric.dong@intel.com>
Sent: Monday, December 14, 2020 8:41 AM
To: Ni, Ray <ray.ni@intel.com>; devel@edk2.groups.io
Cc: Zeng, Star <star.zeng@intel.com>; Lou, Yun <yun.lou@intel.com>; Laszlo Ersek <lersek@redhat.com>
Subject: RE: [PATCH V2] UefiCpuPkg/CpuFeature: reduce time complexty to calc CpuInfo.First
Reviewed-by: Eric Dong <eric.dong@intel.com>
-----Original Message-----
From: Ni, Ray <ray.ni@intel.com>
Sent: Friday, December 11, 2020 6:48 PM
To: devel@edk2.groups.io
Cc: Dong, Eric <eric.dong@intel.com>; Zeng, Star <star.zeng@intel.com>; Lou, Yun <yun.lou@intel.com>; Laszlo Ersek <lersek@redhat.com>
Subject: [PATCH V2] UefiCpuPkg/CpuFeature: reduce time complexty to calc CpuInfo.First
CpuInfo.First stores whether the current thread belongs to the first package in the platform, first core in a package, first thread in a core.
But the time complexity of original algorithm to calculate the CpuInfo.First is O (n) * O (p) * O (c).
n: number of processors
p: number of packages
c: number of cores per package
The patch trades time with space by storing the first package, first core per package, first thread per core in an array.
The time complexity becomes O (n).
Signed-off-by: Ray Ni <ray.ni@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Yun Lou <yun.lou@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
---
.../CpuFeaturesInitialize.c | 96 +++++++++----------
1 file changed, 47 insertions(+), 49 deletions(-)
diff --git a/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c b/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c
index d4a576385f..a1e972b1a2 100644
--- a/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c
+++ b/UefiCpuPkg/Library/RegisterCpuFeaturesLib/CpuFeaturesInitialize.c
@@ -105,7 +105,10 @@ CpuInitDataInitialize (
EFI_CPU_PHYSICAL_LOCATION *Location; UINT32 PackageIndex; UINT32 CoreIndex;- UINT32 First;+ UINTN Pages;+ UINT32 FirstPackage;+ UINT32 *FirstCore;+ UINT32 *FirstThread; ACPI_CPU_DATA *AcpiCpuData; CPU_STATUS_INFORMATION *CpuStatus; UINT32 *ThreadCountPerPackage;@@ -236,74 +239,69 @@ CpuInitDataInitialize (
// // Initialize CpuFeaturesData->InitOrder[].CpuInfo.First+ // Use AllocatePages () instead of AllocatePool () because pool cannot be freed in PEI phase but page can. //+ Pages = EFI_SIZE_TO_PAGES (CpuStatus->PackageCount * sizeof (UINT32) + CpuStatus->PackageCount * CpuStatus->MaxCoreCount * sizeof (UINT32));+ FirstCore = AllocatePages (Pages);+ ASSERT (FirstCore != NULL);+ FirstThread = FirstCore + CpuStatus->PackageCount; //- // Set First.Package for each thread belonging to the first package.+ // Set FirstPackage, FirstCore[], FirstThread[] to maximum package ID, core ID, thread ID. //- First = MAX_UINT32;+ FirstPackage = MAX_UINT32;+ SetMem32 (FirstCore, CpuStatus->PackageCount * sizeof (UINT32), MAX_UINT32);+ SetMem32 (FirstThread, CpuStatus->PackageCount * CpuStatus->MaxCoreCount * sizeof (UINT32), MAX_UINT32);+ for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) { Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;- First = MIN (Location->Package, First);++ //+ // Save the minimum package ID in the platform.+ //+ FirstPackage = MIN (Location->Package, FirstPackage);+ + //+ // Save the minimum core ID per package.+ //+ FirstCore[Location->Package] = MIN (Location->Core, FirstCore[Location->Package]);+ + //+ // Save the minimum thread ID per core.+ //+ FirstThread[Location->Package * CpuStatus->MaxCoreCount + Location->Core] = MIN (+ Location->Thread,+ FirstThread[Location->Package * CpuStatus->MaxCoreCount + Location->Core]+ ); }++ //+ // Update the First field.+ // for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) { Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;- if (Location->Package == First) {++ if (Location->Package == FirstPackage) { CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Package = 1; }- } - //- // Set First.Die/Tile/Module for each thread assuming:- // single Die under each package, single Tile under each Die, single Module under each Tile- //- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {+ //+ // Set First.Die/Tile/Module for each thread assuming:+ // single Die under each package, single Tile under each Die, single Module under each Tile+ // CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Die = 1; CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Tile = 1; CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Module = 1;- } - for (PackageIndex = 0; PackageIndex < CpuStatus->PackageCount; PackageIndex++) {- //- // Set First.Core for each thread in the first core of each package.- //- First = MAX_UINT32;- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {- Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;- if (Location->Package == PackageIndex) {- First = MIN (Location->Core, First);- }+ if (Location->Core == FirstCore[Location->Package]) {+ CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Core = 1; }-- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {- Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;- if (Location->Package == PackageIndex && Location->Core == First) {- CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Core = 1;- }+ if (Location->Thread == FirstThread[Location->Package * CpuStatus->MaxCoreCount + Location->Core]) {+ CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Thread = 1; } } - for (PackageIndex = 0; PackageIndex < CpuStatus->PackageCount; PackageIndex++) {- for (CoreIndex = 0; CoreIndex < CpuStatus->MaxCoreCount; CoreIndex++) {- //- // Set First.Thread for the first thread of each core.- //- First = MAX_UINT32;- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {- Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;- if (Location->Package == PackageIndex && Location->Core == CoreIndex) {- First = MIN (Location->Thread, First);- }- }-- for (ProcessorNumber = 0; ProcessorNumber < NumberOfCpus; ProcessorNumber++) {- Location = &CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.ProcessorInfo.Location;- if (Location->Package == PackageIndex && Location->Core == CoreIndex && Location->Thread == First) {- CpuFeaturesData->InitOrder[ProcessorNumber].CpuInfo.First.Thread = 1;- }- }- }- }+ FreePages (FirstCore, Pages); } /**--
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