Skip to content

K
Kernel

openeuler / Kernel
1 年多 前同步成功

通知 8
Star 0
Fork 0
K
Kernel
切换分支/标签
  1. 20 1月, 2018 1 次提交
  3. 16 1月, 2018 1 次提交
  5. 10 8月, 2017 2 次提交
  7. 03 8月, 2017 19 次提交
  9. 02 8月, 2017 2 次提交
  11. 02 6月, 2017 4 次提交
  13. 03 4月, 2017 1 次提交
    • A
      powerpc: Avoid taking a data miss on every userspace instruction miss · a7a9dcd8
      由 Anton Blanchard 提交于 
      Early on in do_page_fault() we call store_updates_sp(), regardless of
the type of exception. For an instruction miss this doesn't make
sense, because we only use this information to detect if a data miss
is the result of a stack expansion instruction or not.

Worse still, it results in a data miss within every userspace
instruction miss handler, because we try and load the very instruction
we are about to install a pte for!

A simple exec microbenchmark runs 6% faster on POWER8 with this fix:

 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>

int main(int argc, char *argv[])
{
	unsigned long left = atol(argv[1]);
	char leftstr[16];

	if (left-- == 0)
		return 0;

	sprintf(leftstr, "%ld", left);
	execlp(argv[0], argv[0], leftstr, NULL);
	perror("exec failed\n");

	return 0;
}

Pass the number of iterations on the command line (eg 10000) and time
how long it takes to execute.
Signed-off-by: NAnton Blanchard <anton@samba.org>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      a7a9dcd8
  15. 21 3月, 2017 3 次提交
  17. 02 3月, 2017 1 次提交
  19. 15 2月, 2017 1 次提交
    • A
      powerpc/mm: Update PROTFAULT handling in the page fault path · 18061c17
      由 Aneesh Kumar K.V 提交于 
      With radix, we can get page fault with DSISR_PROTFAULT value set in case of
PROT_NONE or autonuma mapping. The PROT_NONE case in handled by the vma check
where we consider the access bad. For autonuma we should fall through and fixup
the access mask correctly.

Without this patch we trigger the WARN_ON() on radix. This code moves that
WARN_ON() within a radix_enabled() check. I also moved the WARN_ON() outside
the if condition making it apply for all type of faults (exec/write/read). It
is also conditionalized for book3s, because BOOK3E can also get a PROTFAULT to
handle the D/I cache sync.
Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      18061c17
  21. 08 2月, 2017 1 次提交
  23. 30 11月, 2016 1 次提交
  25. 25 11月, 2016 1 次提交
  27. 14 11月, 2016 1 次提交
  29. 19 9月, 2016 1 次提交