目录
linux-6.6.y
分支28
标签4628
+ 疑修
Web IDE
Baolin Wang
mm: add statistics for PUD level pagetable


Recently, we found that cross-die access to pagetable pages on ARM64
machines can cause performance fluctuations in our business.  Currently,
there are no PMU events available to track this situation on our ARM64
machines, so accurate pagetable accounting can help to analyze this issue,
but now the PUD level pagetable accounting is missed.


So introduce pagetable_pud_ctor/dtor() to help to get accurate PUD
pagetable accounting, as well as converting the architectures which use
generic PUD pagetable allocation to add corresponding PUD pagetable
accounting.  Moreover this patch will mark the PUD level pagetable with
PG_table flag, which will help to do sanity validation in
unpoison_memory().


On my testing machine, I can see more pagetables statistics after the patch
with page-types tool:


Before patch:
        flags           page-count      MB  symbolic-flags                     long-symbolic-flags
0x0000000004000000           27326      106  _________g       pgtable
After patch:
0x0000000004000000           27541      107  _________g       pgtable


Link: https://lkml.kernel.org/r/876c71c03a7e69c17722a690e3225a4f7b172fb2.1695017383.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang baolin.wang@linux.alibaba.com
Acked-by: Mike Rapoport (IBM) rppt@kernel.org
Acked-by: Vishal Moola (Oracle) vishal.moola@gmail.com
Cc: Andy Lutomirski luto@kernel.org
Cc: Aneesh Kumar K.V aneesh.kumar@linux.ibm.com
Cc: Arnd Bergmann arnd@arndb.de
Cc: Borislav Petkov bp@alien8.de
Cc: Catalin Marinas catalin.marinas@arm.com
Cc: Dave Hansen dave.hansen@linux.intel.com
Cc: Huacai Chen chenhuacai@kernel.org
Cc: Ingo Molnar mingo@redhat.com
Cc: Matthew Wilcox (Oracle) willy@infradead.org
Cc: Nicholas Piggin npiggin@gmail.com
Cc: Peter Zijlstra peterz@infradead.org
Cc: Thomas Bogendoerfer tsbogend@alpha.franken.de
Cc: Thomas Gleixner tglx@linutronix.de
Cc: Will Deacon will@kernel.org
Signed-off-by: Andrew Morton akpm@linux-foundation.org
[ Backport from v6.7-rc1 ]
Signed-off-by: WangYuli wangyuli@uniontech.com
18天前1236933次提交
目录README

Linux kernel

There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first.

In order to build the documentation, use make htmldocs or make pdfdocs. The formatted documentation can also be read online at:

https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.

关于

deepin linux kernel

cassemblyshell
README.md
3.1 GB
邀请码