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Red Hat Enterprise Linux 6 Essentials eBook now available in PDF and ePub formats for only $9.99
RHEL 6 Essentials contains 40 chapters and over 250 pages.

Chapter 6. Memory Tapset

function::vm_fault_contains — Test return value for page fault reason
probe::vm.pagefault — Records that a page fault occurred.
probe::vm.pagefault.return — Indicates what type of fault occurred.
function::addr_to_node — Returns which node a given address belongs to within a NUMA system.
probe::vm.write_shared — Attempts at writing to a shared page.
probe::vm.write_shared_copy — Page copy for shared page write.
probe::vm.mmap — Fires when an mmap is requested.
probe::vm.munmap — Fires when an munmap is requested.
probe::vm.brk — Fires when a brk is requested (i.e. the heap will be resized).
probe::vm.oom_kill — Fires when a thread is selected for termination by the OOM killer.
probe::vm.kmalloc — Fires when kmalloc is requested.
probe::vm.kmem_cache_alloc — Fires when \
probe::vm.kmalloc_node — Fires when kmalloc_node is requested.
probe::vm.kmem_cache_alloc_node — Fires when \
probe::vm.kfree — Fires when kfree is requested.
probe::vm.kmem_cache_free — Fires when \
function::proc_mem_size — Total program virtual memory size in pages
function::proc_mem_size_pid — Total program virtual memory size in pages
function::proc_mem_rss — Program resident set size in pages
function::proc_mem_rss_pid — Program resident set size in pages
function::proc_mem_shr — Program shared pages (from shared mappings)
function::proc_mem_shr_pid — Program shared pages (from shared mappings)
function::proc_mem_txt — Program text (code) size in pages
function::proc_mem_txt_pid — Program text (code) size in pages
function::proc_mem_data — Program data size (data + stack) in pages
function::proc_mem_data_pid — Program data size (data + stack) in pages
function::mem_page_size — Number of bytes in a page for this architecture
function::bytes_to_string — Human readable string for given bytes
function::pages_to_string — Turns pages into a human readable string
function::proc_mem_string — Human readable string of current proc memory usage
function::proc_mem_string_pid — Human readable string of process memory usage
This family of probe points is used to probe memory-related events or query the memory usage of the current process. It contains the following probe points:

Name

function::vm_fault_contains — Test return value for page fault reason

Synopsis

function vm_fault_contains:long(value:long,test:long)

Arguments

value
The fault_type returned by vm.page_fault.return
test
The type of fault to test for (VM_FAULT_OOM or similar)

Name

probe::vm.pagefault — Records that a page fault occurred.

Synopsis

vm.pagefault

Values

write_access
Indicates whether this was a write or read access; 1 indicates a write, while 0 indicates a read.
name
Name of the probe point
address
The address of the faulting memory access; i.e. the address that caused the page fault.

Context

The process which triggered the fault

Name

probe::vm.pagefault.return — Indicates what type of fault occurred.

Synopsis

vm.pagefault.return

Values

name
Name of the probe point
fault_type
Returns either 0 (VM_FAULT_OOM) for out of memory faults, 2 (VM_FAULT_MINOR) for minor faults, 3 (VM_FAULT_MAJOR) for major faults, or 1 (VM_FAULT_SIGBUS) if the fault was neither OOM, minor fault, nor major fault.

Name

function::addr_to_node — Returns which node a given address belongs to within a NUMA system.

Synopsis

function addr_to_node:long(addr:long)

Arguments

addr
The address of the faulting memory access.

General Syntax

addr_to_node:long(addr:long)

Description

This function accepts an address, and returns the node that the given address belongs to in a NUMA system.

Name

probe::vm.write_shared — Attempts at writing to a shared page.

Synopsis

vm.write_shared

Values

name
Name of the probe point
address
The address of the shared write.

Context

The context is the process attempting the write.

Description

Fires when a process attempts to write to a shared page. If a copy is necessary, this will be followed by a vm.write_shared_copy.

Name

probe::vm.write_shared_copy — Page copy for shared page write.

Synopsis

vm.write_shared_copy

Values

name
Name of the probe point
zero
Boolean indicating whether it is a zero page (can do a clear instead of a copy).
address
The address of the shared write.

Context

The process attempting the write.

Description

Fires when a write to a shared page requires a page copy. This is always preceded by a vm.shared_write.

Name

probe::vm.mmap — Fires when an mmap is requested.

Synopsis

vm.mmap

Values

length
The length of the memory segment
name
Name of the probe point
address
The requested address

Context

The process calling mmap.

Name

probe::vm.munmap — Fires when an munmap is requested.

Synopsis

vm.munmap

Values

length
The length of the memory segment
name
Name of the probe point
address
The requested address

Context

The process calling munmap.

Name

probe::vm.brk — Fires when a brk is requested (i.e. the heap will be resized).

Synopsis

vm.brk

Values

length
The length of the memory segment
name
Name of the probe point
address
The requested address

Context

The process calling brk.

Name

probe::vm.oom_kill — Fires when a thread is selected for termination by the OOM killer.

Synopsis

vm.oom_kill

Values

name
Name of the probe point
task
The task being killed

Context

The process that tried to consume excessive memory, and thus triggered the OOM.

Name

probe::vm.kmalloc — Fires when kmalloc is requested.

Synopsis

vm.kmalloc

Values

ptr
Pointer to the kmemory allocated
caller_function
Name of the caller function.
call_site
Address of the kmemory function.
gfp_flag_name
type of kmemory to allocate (in String format)
name
Name of the probe point
bytes_req
Requested Bytes
bytes_alloc
Allocated Bytes
gfp_flags
type of kmemory to allocate

Name

probe::vm.kmem_cache_alloc — Fires when \

Synopsis

vm.kmem_cache_alloc

Values

ptr
Pointer to the kmemory allocated
caller_function
Name of the caller function.
call_site
Address of the function calling this kmemory function.
gfp_flag_name
Type of kmemory to allocate(in string format)
name
Name of the probe point
bytes_req
Requested Bytes
bytes_alloc
Allocated Bytes
gfp_flags
type of kmemory to allocate

Description

kmem_cache_alloc is requested.

Name

probe::vm.kmalloc_node — Fires when kmalloc_node is requested.

Synopsis

vm.kmalloc_node

Values

ptr
Pointer to the kmemory allocated
caller_function
Name of the caller function.
call_site
Address of the function caling this kmemory function.
gfp_flag_name
Type of kmemory to allocate(in string format)
name
Name of the probe point
bytes_req
Requested Bytes
bytes_alloc
Allocated Bytes
gfp_flags
type of kmemory to allocate

Name

probe::vm.kmem_cache_alloc_node — Fires when \

Synopsis

vm.kmem_cache_alloc_node

Values

ptr
Pointer to the kmemory allocated
caller_function
Name of the caller function.
call_site
Address of the function calling this kmemory function.
gfp_flag_name
Type of kmemory to allocate(in string format)
name
Name of the probe point
bytes_req
Requested Bytes
bytes_alloc
Allocated Bytes
gfp_flags
type of kmemory to allocate

Description

kmem_cache_alloc_node is requested.

Name

probe::vm.kfree — Fires when kfree is requested.

Synopsis

vm.kfree

Values

ptr
Pointer to the kmemory allocated which is returned by kmalloc
caller_function
Name of the caller function.
call_site
Address of the function calling this kmemory function.
name
Name of the probe point

Name

probe::vm.kmem_cache_free — Fires when \

Synopsis

vm.kmem_cache_free

Values

ptr
Pointer to the kmemory allocated which is returned by kmem_cache
caller_function
Name of the caller function.
call_site
Address of the function calling this kmemory function.
name
Name of the probe point

Description

kmem_cache_free is requested.

Name

function::proc_mem_size — Total program virtual memory size in pages

Synopsis

function proc_mem_size:long()

Arguments

None

Description

Returns the total virtual memory size in pages of the current process, or zero when there is no current process or the number of pages couldn't be retrieved.

Name

function::proc_mem_size_pid — Total program virtual memory size in pages

Synopsis

function proc_mem_size_pid:long(pid:long)

Arguments

pid
The pid of process to examine

Description

Returns the total virtual memory size in pages of the given process, or zero when that process doesn't exist or the number of pages couldn't be retrieved.

Name

function::proc_mem_rss — Program resident set size in pages

Synopsis

function proc_mem_rss:long()

Arguments

None

Description

Returns the resident set size in pages of the current process, or zero when there is no current process or the number of pages couldn't be retrieved.

Name

function::proc_mem_rss_pid — Program resident set size in pages

Synopsis

function proc_mem_rss_pid:long(pid:long)

Arguments

pid
The pid of process to examine

Description

Returns the resident set size in pages of the given process, or zero when the process doesn't exist or the number of pages couldn't be retrieved.

Name

function::proc_mem_shr — Program shared pages (from shared mappings)

Synopsis

function proc_mem_shr:long()

Arguments

None

Description

Returns the shared pages (from shared mappings) of the current process, or zero when there is no current process or the number of pages couldn't be retrieved.

Name

function::proc_mem_shr_pid — Program shared pages (from shared mappings)

Synopsis

function proc_mem_shr_pid:long(pid:long)

Arguments

pid
The pid of process to examine

Description

Returns the shared pages (from shared mappings) of the given process, or zero when the process doesn't exist or the number of pages couldn't be retrieved.

Name

function::proc_mem_txt — Program text (code) size in pages

Synopsis

function proc_mem_txt:long()

Arguments

None

Description

Returns the current process text (code) size in pages, or zero when there is no current process or the number of pages couldn't be retrieved.

Name

function::proc_mem_txt_pid — Program text (code) size in pages

Synopsis

function proc_mem_txt_pid:long(pid:long)

Arguments

pid
The pid of process to examine

Description

Returns the given process text (code) size in pages, or zero when the process doesn't exist or the number of pages couldn't be retrieved.

Name

function::proc_mem_data — Program data size (data + stack) in pages

Synopsis

function proc_mem_data:long()

Arguments

None

Description

Returns the current process data size (data + stack) in pages, or zero when there is no current process or the number of pages couldn't be retrieved.

Name

function::proc_mem_data_pid — Program data size (data + stack) in pages

Synopsis

function proc_mem_data_pid:long(pid:long)

Arguments

pid
The pid of process to examine

Description

Returns the given process data size (data + stack) in pages, or zero when the process doesn't exist or the number of pages couldn't be retrieved.

Name

function::mem_page_size — Number of bytes in a page for this architecture

Synopsis

function mem_page_size:long()

Arguments

None

Name

function::bytes_to_string — Human readable string for given bytes

Synopsis

function bytes_to_string:string(bytes:long)

Arguments

bytes
Number of bytes to translate.

Description

Returns a string representing the number of bytes (up to 1024 bytes), the number of kilobytes (when less than 1024K) postfixed by 'K', the number of megabytes (when less than 1024M) postfixed by 'M' or the number of gigabytes postfixed by 'G'. If representing K, M or G, and the number is amount is less than 100, it includes a '.' plus the remainer. The returned string will be 5 characters wide (padding with whitespace at the front) unless negative or representing more than 9999G bytes.

Name

function::pages_to_string — Turns pages into a human readable string

Synopsis

function pages_to_string:string(pages:long)

Arguments

pages
Number of pages to translate.

Description

Multiplies pages by page_size to get the number of bytes and returns the result of bytes_to_string.

Name

function::proc_mem_string — Human readable string of current proc memory usage

Synopsis

function proc_mem_string:string()

Arguments

None

Description

Returns a human readable string showing the size, rss, shr, txt and data of the memory used by the current process. For example size: 301m, rss: 11m, shr: 8m, txt: 52k, data: 2248k.

Name

function::proc_mem_string_pid — Human readable string of process memory usage

Synopsis

function proc_mem_string_pid:string(pid:long)

Arguments

pid
The pid of process to examine

Description

Returns a human readable string showing the size, rss, shr, txt and data of the memory used by the given process. For example size: 301m, rss: 11m, shr: 8m, txt: 52k, data: 2248k.

 
 
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