audk/UefiCpuPkg/PiSmmCpuDxeSmm
Zeng, Star e992cc3f48 UefiCpuPkg PiSmmCpuDxeSmm: Reduce SMRAM consumption in CpuS3.c
This patch makes two refinements to reduce SMRAM consumption in CpuS3.c.
1. Only do CopyRegisterTable() when register table is not empty,
  IsRegisterTableEmpty() is created to check whether the register table
  is empty or not.

  Take empty PreSmmInitRegisterTable as example, about 24K SMRAM consumption
  could be reduced when mAcpiCpuData.NumberOfCpus=1024.
  sizeof (CPU_REGISTER_TABLE) = 24
  mAcpiCpuData.NumberOfCpus = 1024 = 1K
  mAcpiCpuData.NumberOfCpus * sizeof (CPU_REGISTER_TABLE) = 24K

2. Only copy table entries buffer instead of whole buffer.
  AllocatedSize in SourceRegisterTableList is the whole buffer size.
  Actually, only the table entries buffer needs to be copied, and the size
  is TableLength * sizeof (CPU_REGISTER_TABLE_ENTRY).

  Take AllocatedSize=0x1000=4096, TableLength=100 and NumberOfCpus=1024 as example,
  about 1696K SMRAM consumption could be reduced.
  sizeof (CPU_REGISTER_TABLE_ENTRY) = 24
  TableLength = 100
  TableLength * sizeof (CPU_REGISTER_TABLE_ENTRY) = 2400
  AllocatedSize = 0x1000 = 4096
  AllocatedSize - TableLength * sizeof (CPU_REGISTER_TABLE_ENTRY) = 4096 - 2400 = 1696
  NumberOfCpus = 1024 = 1K
  NumberOfCpus * (AllocatedSize - TableLength * sizeof (CPU_REGISTER_TABLE_ENTRY)) = 1696K

This patch also corrects the CopyRegisterTable() function description.

Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20210111015419.28368-1-star.zeng@intel.com>
2021-01-11 09:13:48 +00:00
..
Ia32 UefiCpuPkg/PiSmmCpuDxeSmm: Reflect page table depth with page table address 2020-11-18 04:52:26 +00:00
X64 UefiCpuPkg/PiSmmCpuDxeSmm: Reflect page table depth with page table address 2020-11-18 04:52:26 +00:00
CpuS3.c UefiCpuPkg PiSmmCpuDxeSmm: Reduce SMRAM consumption in CpuS3.c 2021-01-11 09:13:48 +00:00
CpuService.c UefiCpuPkg: Replace BSD License with BSD+Patent License 2019-04-09 10:58:28 -07:00
CpuService.h UefiCpuPkg: Replace BSD License with BSD+Patent License 2019-04-09 10:58:28 -07:00
MpService.c UefiCpuPkg/PiSmmCpuDxeSmm: pause in WaitForSemaphore() before re-fetch 2020-07-31 13:27:50 +00:00
PiSmmCpuDxeSmm.c UefiCpuPkg/PiSmm: Fix various typos 2020-02-10 22:30:07 +00:00
PiSmmCpuDxeSmm.h UefiCpuPkg/PiSmmCpuDxeSmm: Reflect page table depth with page table address 2020-11-18 04:52:26 +00:00
PiSmmCpuDxeSmm.inf UefiCpuPkg/PiSmmCpuDxeSmm: Avoid allocate Token every time 2019-12-06 06:41:16 +00:00
PiSmmCpuDxeSmm.uni UefiCpuPkg: Replace BSD License with BSD+Patent License 2019-04-09 10:58:28 -07:00
PiSmmCpuDxeSmmExtra.uni UefiCpuPkg: Replace BSD License with BSD+Patent License 2019-04-09 10:58:28 -07:00
SmmCpuMemoryManagement.c UefiCpuPkg/PiSmmCpuDxeSmm: Reflect page table depth with page table address 2020-11-18 04:52:26 +00:00
SmmMp.c UefiCpuPkg/PiSmmCpuDxeSmm: Enable MM MP Protocol 2019-07-16 11:54:55 +08:00
SmmMp.h UefiCpuPkg/PiSmmCpuDxeSmm: Keep function comment and declaration adjacent 2019-08-02 14:19:13 +08:00
SmmProfile.c UefiCpuPkg: PiSmmCpuDxeSmm skip MSR_IA32_MISC_ENABLE manipulation on AMD 2020-07-07 23:25:16 +00:00
SmmProfile.h UefiCpuPkg: Replace BSD License with BSD+Patent License 2019-04-09 10:58:28 -07:00
SmmProfileInternal.h UefiCpuPkg: PiSmmCpuDxeSmm skip MSR_IA32_MISC_ENABLE manipulation on AMD 2020-07-07 23:25:16 +00:00
SmramSaveState.c UefiCpuPkg/PiSmm: Fix various typos 2020-02-10 22:30:07 +00:00
SyncTimer.c UefiCpuPkg: Replace BSD License with BSD+Patent License 2019-04-09 10:58:28 -07:00