Branch: refs/heads/master
Home: https://github.com/tianocore/edk2
Commit: fcd71642df9a3a5932a2db116acc6fe23458d8f5
https://github.com/tianocore/edk2/commit/fcd71642df9a3a5932a2db116acc6fe23458d8f5
Author: duntan <dun....@intel.com>
Date: 2023-06-21 (Wed, 21 Jun 2023)
Changed paths:
M MdePkg/Library/SmmMemoryAllocationLib/MemoryAllocationLib.c
Log Message:
-----------
MdePkg: Code optimization to SMM InternalAllocateAlignedPages
This commit is code optimization to InternalAllocateAlignedPages of
SmmMemoryAllocationLib which can reduce free memory fragments. Also
it can reduce one pre-allocation page.
Let's take a simple example:
The expected pages size is 8KB, Alignment value is 8KB.
In original InternalAllocateAlignedPages(), the first step is to
allocate 4 pages and then find the first 8KB-aligned address in
allocated 4 pages. If the upper limit address of allocated 4 pages
is already 8KB aligned, then the allocated 4 pages contains two
8KB-aligned 8KB ranges. The lower 2 pages will be selected and
removed from free pages. Then the higher 2 pages will be free.
Since the whole memory allocation is from high address to low
address, then the higher 2 pages cann't be merged with other free
pages, causing the free memory fragments.
However, when only allocate 3(2+2-1) pages, we can avoid the free
memory fragments in specific case. Also 3 pages must contain a
8KB-aligned 8KB range, which meets the requirement. If the upper
limit address of allocated 3 pages is 8KB-aligned, then the higher
2 pages range of allocated 3 pages is 8KB-aligned and will be
selected and removed from free pages. The remaining lower one page
of allocated 3 pages will be free and merged with left lower free
memory. This can reduce free memory fragments in smm.
Signed-off-by: Dun Tan <dun....@intel.com>
Cc: Ray Ni <ray...@intel.com>
Reviewed-by: Michael D Kinney <michael.d.kin...@intel.com>
Cc: Liming Gao <gaolim...@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang....@intel.com>
_______________________________________________
edk2-commits mailing list
edk2-commits@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/edk2-commits
