diff options
| author | Jian J Wang <jian.j.wang@intel.com> | 2018-01-18 15:29:01 +0800 |
|---|---|---|
| committer | Star Zeng <star.zeng@intel.com> | 2018-01-22 09:22:45 +0800 |
| commit | fe5adb77df646808f471a62cc91a672d9d4ef32c (patch) | |
| tree | ded86e640439e19656af72dda91523e167da9935 /UefiCpuPkg | |
| parent | 7ce3491760eb4097e8c1b5b0e6c928dcf2c2a692 (diff) | |
| download | edk2-fe5adb77df646808f471a62cc91a672d9d4ef32c.tar.gz edk2-fe5adb77df646808f471a62cc91a672d9d4ef32c.tar.bz2 edk2-fe5adb77df646808f471a62cc91a672d9d4ef32c.zip | |
UefiCpuPkg/CpuDxe: fix bad boot performance
If features like memory profile, protection and heap guard are enabled,
a lot of more memory page attributes update actions will happen than
usual. An unnecessary sync of CR0.WP setting among APs will then cause
worse performance in memory allocation action. Removing the calling of
SyncMemoryPageAttributesAp() in function DisableReadOnlyPageWriteProtect
and EnableReadOnlyPageWriteProtect can fix this problem. In DEBUG build
case, the boot performance can be boosted from 11 minute to 6 minute.
Cc: Eric Dong <eric.dong@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
(cherry picked from commit 0dbb0f1a5ce6a9ec5213c85e5d4244cf5b061417)
Diffstat (limited to 'UefiCpuPkg')
| -rw-r--r-- | UefiCpuPkg/CpuDxe/CpuPageTable.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/UefiCpuPkg/CpuDxe/CpuPageTable.c b/UefiCpuPkg/CpuDxe/CpuPageTable.c index 90d9823838..a33ac5519e 100644 --- a/UefiCpuPkg/CpuDxe/CpuPageTable.c +++ b/UefiCpuPkg/CpuDxe/CpuPageTable.c @@ -597,7 +597,6 @@ DisableReadOnlyPageWriteProtect ( )
{
AsmWriteCr0 (AsmReadCr0() & ~BIT16);
- SyncMemoryPageAttributesAp (SyncCpuDisableWriteProtection);
}
/**
@@ -609,7 +608,6 @@ EnableReadOnlyPageWriteProtect ( )
{
AsmWriteCr0 (AsmReadCr0() | BIT16);
- SyncMemoryPageAttributesAp (SyncCpuEnableWriteProtection);
}
/**
|