On 8/1/22 9:47 PM, Leizhen (ThunderTown) wrote:
On 2022/8/1 16:20, Baoquan He wrote:
Hi Catalin,
On 07/11/22 at 05:03pm, Zhen Lei wrote:
v2 --> v3:
1. Discard patch 3 in v2, a cleanup patch.
v1 --> v2:
1. Update the commit message of Patch 1, explicitly indicates that "crashkernel=X,high"
is specified but "crashkernel=Y,low" is not specified.
2. Drop Patch 4-5. Currently, focus on function integrity, performance optimization
will be considered in later versions.
3. Patch 3 is not mandatory, it's just a cleanup now, although it is a must for patch 4-5.
But to avoid subsequent duplication of effort, I'm glad it was accepted.
v1:
After the basic functions of "support reserving crashkernel above 4G on arm64
kdump"(see https://urldefense.com/v3/__https://lkml.org/lkml/2022/5/6/428__;!!ACWV5N9M2RV99hQ!ORBFa4UAmMss_79nuwu1kpW3D-mTela240vFo0FXOuV9QpGWy7Fp2H81ZjLPOuaufAQC_XBFEFGjAqs5njfGS6Rd4dZLhaez$ ) are implemented, we still have
three features to be improved.
1. When crashkernel=X,high is specified but crashkernel=Y,low is not specified,
the default crash low memory size is provided.
2. For crashkernel=X without '@offset', if the low memory fails to be allocated,
fall back to reserve region from high memory(above DMA zones).
3. If crashkernel=X,high is used, page mapping is performed only for the crash
high memory, and block mapping is still used for other linear address spaces.
Compared to the previous version:
(1) For crashkernel=X[@offset], the memory above 4G is not changed to block
mapping, leave it to the next time.
(2) The implementation method is modified. Now the implementation is simpler
and clearer.
Do you have plan to pick this series so that it can be taken into 5.20
rc-1~3?
Hi, Catalin:
Only function reserve_crashkernel() is modified in these two patches. The core
process of the arm64 architecture is not affected. I remember you suggested that
arm64 and x86 share the same kdump code, so these two subfeatures are needed.
Maybe we can lay the foundation first for the people who build the road. Unifying
the external interfaces of kdump on arm64 and x86 does not seem to hurt.
We have back ported the basic crashkernel=high, low, support into our
distros and have taken wide testing on arm64 servers, need this patchset
to back port for more testing.
Thanks
Baoquan
Zhen Lei (2):
arm64: kdump: Provide default size when crashkernel=Y,low is not
specified
arm64: kdump: Support crashkernel=X fall back to reserve region above
DMA zones
.../admin-guide/kernel-parameters.txt | 10 ++-----
arch/arm64/mm/init.c | 28 +++++++++++++++++--
2 files changed, 28 insertions(+), 10 deletions(-)
--
2.25.1
.
Hi ,
What is the progress of this series ?
Without this patch set we are seeing larger crashkernel=896M failures
on Arm with Linux-6.0.rc7. This larger value is needed for
iSCSI booted systems with certain network adapters.
Thank you,
John.
