Red Hat ENTERPRISE LINUX 5.4 - SYSTEMTAP LANGUAGE Instrukcja Użytkownika Pobierz pdf (Strona 5)

Kernel Generic Features

3.2. Kernel Generic Features

The recommended minimal memory requirement on x86 and x86_64 for Red Hat Enterprise Linux 5.5

is now 1GB per logical CPU.

Note

A logical CPU is defined as any entity that can be scheduled (i.e. every core or thread in a

multi-core or multi-thread processor is defined as a logical CPU).

Detecting kernel tasks stuck in the uninterruptible sleep state

In some circumstances, tasks in the kernel may permanently enter the uninterruptible sleep state (D-

State), making the system impossible to shut down. With this update, the Detect Hung Task kernel

thread has been added, providing the ability to detect tasks permanently stuck in the D-State.

This new feature is controlled by the CONFIG_DETECT_HUNG_TASK kernel flag. When set

to "y" tasks stuck in the D-State are detected; when set to n it is off. The default value for the

CONFIG_DETECT_HUNG_TASK flag is y.

Additionally, the CONFIG_BOOTPARAM_HUNG_TASK_PANIC flag has been added. When set to y,

a kernel panic is triggered when a task stuck in the D-State is detected. The default value for the

CONFIG_BOOTPARAM_HUNG_TASK_PANIC flag is n.

BZ#506059

Signed s390 Kernel Modules

Starting at Red Hat Enterprise Linux 5.5, all s390 kernel modules are now signed. BZ#483665

BZ#456181

, BZ#448130

, BZ#427709

4. Device Drivers

the hpilo driver for HP iLO/iLO2 management processors has been updated.

The Advanced Linux Sound Architecture (ALSA) has been updated — providing enhanced support for

High Definition Audio (HDA). (BZ#525390

the i2c device driver for the iic-bus interface has been updated with support for the SB900 SMBus

controller. (BZ#516623

)

the mlx4 driver for Mellanox ConnectX HCA InfiniBand devices has been updated to version 1.4.1

(BZ#514147

BZ#500346

)

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=506059

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=483665

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=456181

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=448130

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=427709

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=525390

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=516623

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=514147

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Red Hat ENTERPRISE LINUX 5.4 - SYSTEMTAP LANGUAGE Instrukcja Użytkownika Strona 5