Skip to content

K
Kernel

openeuler / Kernel
大约 2 年 前同步成功

通知 8
Star 0
Fork 0
K
Kernel
切换分支/标签
  1. 09 2月, 2022 27 次提交
  3. 08 2月, 2022 1 次提交
  5. 29 1月, 2022 1 次提交
  7. 26 1月, 2022 3 次提交
    • L
      etmem: Add a scan flag to support specified page swap-out · 353db299
      由 liubo 提交于 
      euleros inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4QVXW
CVE: NA

-------------------------------------------------
etmem, the memory vertical expansion technology,

The existing memory expansion tool etmem swaps out all pages that can be
swapped out for the process by default, unless the page is marked with
lock flag.

The function of swapping out specified pages is added. The process adds
VM_SWAPFLAG flags for pages to be swapped out. The etmem adds filters to
the scanning module and swaps out only these pages.
Signed-off-by: Nliubo <liubo254@huawei.com>
Reviewed-by: NMiaohe Lin <linmiaohe@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
      353db299
    • L
      etmem: add swapcache reclaim to etmem · d2869c60
      由 liubo 提交于 
      euleros inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4QVXW
CVE: NA

-------------------------------------------------
etmem, the memory vertical expansion technology,

In the current etmem process, memory page swapping is implemented by
invoking shrink_page_list. When this interface is invoked for the first
time, pages are added to the swap cache and written to disks.The swap
cache page is reclaimed only when this interface is invoked for the
second time and no process accesses the page.However, in the etmem
process, the user mode scans pages that have been accessed, and the
migration is not delivered to pages that are not accessed by processes.
Therefore, the swap cache may always be occupied.
To solve the preceding problem, add the logic for actively reclaiming
the swap cache.When the swap cache occupies a large amount of memory,
the system proactively scans the LRU linked list and reclaims the
swap cache to save memory within the specified range.
Signed-off-by: Nliubo <liubo254@huawei.com>
Reviewed-by: NMiaohe Lin <linmiaohe@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
      d2869c60
    • L
      etmem: add original kernel swap enabled options · 44983705
      由 liubo 提交于 
      euleros inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4QVXW
CVE: NA

-------------------------------------------------

etmem, the memory vertical expansion technology,
uses DRAM and high-performance storage new media to form multi-level
memory storage.
By grading the stored data, etmem migrates the classified cold
storage data from the storage medium to the high-performance
storage medium,
so as to achieve the purpose of memory capacity expansion and
memory cost reduction.

When the memory expansion function etmem is running, the native
swap function of the kernel needs to be disabled in certain
scenarios to avoid the impact of kernel swap.

This feature provides the preceding functions.

The /sys/kernel/mm/swap/ directory provides the kernel_swap_enable
sys interface to enable or disable the native swap function
of the kernel.

The default value of /sys/kernel/mm/swap/kernel_swap_enable is true,
that is, kernel swap is enabled by default.

Turn on kernel swap:
	echo true > /sys/kernel/mm/swap/kernel_swap_enable

Turn off kernel swap:
	echo false > /sys/kernel/mm/swap/kernel_swap_enable
Signed-off-by: Nliubo <liubo254@huawei.com>
Reviewed-by: NMiaohe Lin <linmiaohe@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
      44983705
  9. 17 1月, 2022 4 次提交
  11. 31 12月, 2021 1 次提交
    • Z
      mm: export collect_procs() · bb784b81
      由 Zhang Jian 提交于 
      ascend inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4OXH9
CVE: NA

-------------------------------------------------

Collect the processes who have the page mapped via collect_procs().

@page if the page is a part of the hugepages/compound-page, we must
using compound_head() to find it's head page to prevent the kernel panic,
and make the page be locked.

@to_kill the function will return a linked list, when we have used
this list, we must kfree the list.

@force_early if we want to find all process, we must make it be true, if
it's false, the function will only return the process who have PF_MCE_PROCESS
or PF_MCE_EARLY mark.

limits: if force_early is true, sysctl_memory_failure_early_kill is useless.
If it's false, no process have PF_MCE_PROCESS and PF_MCE_EARLY flag, and
the sysctl_memory_failure_early_kill is enabled, function will return all tasks
whether the task have the PF_MCE_PROCESS and PF_MCE_EARLY flag.
Signed-off-by: NZhang Jian <zhangjian210@huawei.com>
Reviewed-by: NWeilong Chen <chenweilong@huawei.com>
Reviewed-by: Kefeng Wang<wangkefeng.wang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
      bb784b81
  13. 30 12月, 2021 2 次提交
  15. 28 12月, 2021 1 次提交