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Kernel 2.4.7: Experimental
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This page will be used to accommodate code drops that are EXPERIMENTAL.
Experimental code drops only have limited testing and may not install or
function in all environments. These patches need not be compatible with
other patches on developerworks for Linux for S/390 either.
The purpose of experimental code drops is early publication of on-going
efforts at IBM to allow for
- code review and
- early experiments by "power users".
This page may also be used to "submit" code into the development streams
of open source projects.
Warning You may not use experimental patches on a production system
or on any system that may get authority over a production system or access
to data of a production system. Disregarding this rule may result in severe
data loss.
Experimental patches eventually disappear as they will be included in a
following release unless proven wrong or replaced by better code.
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If you download any software from this web site please be aware of the
Warranty Disclaimer and Limitation of Liabilities.
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z90crypt-2.4.7-s390x-2.tar.gz MD5 and
z90crypt-2.4.7-s390x-2-timer.tar.gz MD5 (2002-01-21)
The cryptographic device driver z90crypt for 64-bit is provided for the first time.
Using z90crypt on 64-bit Kernel 2.4.7 requires the "additional IOCTL translation support" kernel-patch introduced 2002-01-21.
Documentation for z90crypt is included in the "Linux for zSeries Device Driver and Installation Commands" manual.
Using z90crypt on VM-guests requires z/VM 4.2 and APAR VM62905.
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linux-2.4.7-order2-2.tar.gz MD5
experimental (2001-12-12)
This patch contains a complete replacement for the original (2001-11-09) "order 2 allocation relief" patch. The original patch decreased the kernel stack size to 8KB which turned out to be not enough.
As a side-effect of this new patch there is no longer a need for special OCO-modules.
| Description: |
Order 2 allocation relief. |
| Symptom: |
Under stress and after long uptimes of a 64 bit system the
error message "__alloc_pages: 2-order allocation failed."
appears and either the fork of a new process fails or an
active process dies. |
| Problem: |
The order 2 allocation problem is based in the size of the
region and segment tables as defined by the zSeries architecture.
A full region or segment table in 64 bit mode takes 16 KB of
contiguous real memory. The page allocation routines do not
guarantee that a higher order allocation will succeed due to
memory fragmentation. |
| Solution: |
The order 2 allocation fix is supposed to reduce the number of
order 2 allocations for the region and segment tables to a
minimum. To do so it uses a feature of the architecture that
allows to create incomplete region and segment tables. In almost
all cases a process does not need full region or segment tables.
If a full region or segment table is needed it is reallocated to
the full size. |
Important notices:
- This patch is very S/390 specific and breaks all other
architectures.
- This patch does only work for a 64-bit Linux for zSeries
kernel and should not be applied if you intend to build a
31-bit kernel.
- This patch is not compatible with the 2001-10-12 (nor the
2001-09-14) "on-demand timer" patch.
To create the complete linux kernel sources, the following patches
need to be applied in sequence:
linux-2.4.7.tar.gz (GNU)
+ linux-2.4.7-s390.diff (IBM)
+ linux-2.4.7-s390-1.diff (IBM)
+ linux-2.4.7-s390-2.diff (IBM)
+ linux-2.4.7-s390-3.diff (IBM)
+ linux-2.4.7-s390-4.diff (IBM)
+ linux-2.4.7-order2-2.diff (IBM)
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The following experimental 64-bit OCO modules are required for a 64-bit
kernel with the 2001-11-09 patch for "Order 2 allocation relief" applied.
These experimental 64-bit modules are functionally equivalent to the
2001-11-23 recommended modules.
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linux-2.4.7-order2.tar.gz MD5
experimental (2001-11-09)
This patch contains the following linux kernel bug fixes:
| Description: |
Order 2 allocation relief. |
| Symptom: |
Under stress and after long uptimes of a 64 bit system the
error message "__alloc_pages: 2-order allocation failed."
appears and either the fork of a new process fails or an
active process dies. |
| Problem: |
The order 2 allocation problem is based in the size of the
region and segment tables as defined by the zSeries architecture.
A full region or segment table in 64 bit mode takes 16 KB of
contiguous real memory. The page allocation routines do not
guarantee that a higher order allocation will succeed due to
memory fragmentation. |
| Solution: |
The order 2 allocation fix is supposed to reduce the number of
order 2 allocations for the region and segment tables to a
minimum. To do so it uses a feature of the architecture that
allows to create incomplete region and segment tables. In almost
all cases a process does not need full region or segment tables.
If a full region or segment table is needed it is reallocated to
the full size. |
Important notices:
- This patch is very S/390 specific and breaks all other
architectures.
- This patch does only work for a 64-bit Linux for zSeries
kernel and should not be applied if you intend to build a
31-bit kernel.
- This patch is not compatible with the 2001-10-12 (nor the
2001-09-14) "on-demand timer" patch.
- 64-bit kernels built with this patch applied require special
OCO-modules.
To create the complete linux kernel sources, the following patches
need to be applied in sequence:
linux-2.4.7.tar.gz (GNU)
+ linux-2.4.7-s390.diff (IBM)
+ linux-2.4.7-s390-1.diff (IBM)
+ linux-2.4.7-s390-2.diff (IBM)
+ linux-2.4.7-s390-3.diff (IBM)
+ linux-2.4.7-order2.diff (IBM)
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The following experimental 64-bit OCO modules are required for a 64-bit
kernel with the 2001-11-09 patch for "Order 2 allocation relief" applied.
These experimental 64-bit modules are functionally equivalent to the
2001-11-09 recommended modules.
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