Patch Name: PHKL_28465

Patch Description: s700_800 11.22 Processes not reactivated for a long time

Creation Date: 02/12/20

Post Date:  03/01/17

Hardware Platforms - OS Releases:
	s700: 11.22
	s800: 11.22

Products: N/A

Filesets:
	OS-Core.CORE2-KRN,fr=B.11.22,fa=HP-UX_B.11.22_IA,v=HP

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_28465: HANG

Category Tags:
	defect_repair general_release critical halts_system

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_28465

Symptoms:
	PHKL_28465:
	( SR:8606290241 CR:JAGae54167 )
	A process running on the system, once deactivated, takes a
	very long time to be reactivated (few minutes to an hour).
	During this long reactivation interval, the process cannot
	be killed and may appear hung to the end user.  This can
	happen even if there is no memory pressure and a CPU is
	idle.

Defect Description:
	PHKL_28465:
	( SR:8606290241 CR:JAGae54167 )
	The reactivation algorithm is a function based on the
	process size at deactivation time and the current kernel
	pageout rate.  It does not consider if there is sufficient
	available memory for the process.

	If the kernel pageout rate drops very low, and if the
	process size at deactivation time was large, the
	reactivation interval will be very long.

	Resolution:
	The reactivation algorithm now includes a check for memory
	available on the system when considering a process for
	reactivation.  If there is sufficient available memory, then
	the most suitable process will be selected for reactivation,
	even if the kernel pageout rate is very low and the process
	size at deactivation time was large.

Enhancement:
	No

SR:
	8606290241

Patch Files:
	
	OS-Core.CORE2-KRN,fr=B.11.22,fa=HP-UX_B.11.22_IA,v=HP:
	/usr/conf/lib/libvm.a(vm_sched.o)

what(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.22,fa=HP-UX_B.11.22_IA,v=HP:
	/usr/conf/lib/libvm.a(vm_sched.o):
		vm_sched.c $Date: 2002/12/19 20:15:09 $Revision: r11
			.22/1 PATCH_11.22 (PHKL_28465)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.22,fa=HP-UX_B.11.22_IA,v=HP:
	1711111996 71408 /usr/conf/lib/libvm.a(vm_sched.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches: None

Patch Package Size: 90 KBytes

Installation Instructions:
	Please review all instructions and the Hewlett-Packard
	SupportLine User Guide or your Hewlett-Packard support terms
	and conditions for precautions, scope of license,
	restrictions, and, limitation of liability and warranties,
	before installing this patch.
	------------------------------------------------------------
	1. Back up your system before installing a patch.

	2. Login as root.

	3. Copy the patch to the /tmp directory.

	4. Move to the /tmp directory and unshar the patch:

		cd /tmp
		sh PHKL_28465

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_28465.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_28465.  If you do not wish to retain a
	copy of the original software, include the patch_save_files
	option in the swinstall command above:

		-x patch_save_files=false

	WARNING: If patch_save_files is false when a patch is installed,
		 the patch cannot be deinstalled.  Please be careful
		 when using this feature.

	For future reference, the contents of the PHKL_28465.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_28465.depot

	To put this patch on a magnetic tape and install from the
	tape drive, use the command:

		dd if=/tmp/PHKL_28465.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None