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// memory/vm related tapset
// Copyright (C) 2005, 2006 IBM Corp.
// Copyright (C) 2006 Intel Corporation.
// Copyright (C) 2014-2019 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
// <tapsetdescription>
// This family of probe points is used to probe memory-related events.
// </tapsetdescription>
%{
#include <linux/mm.h>
%}
global VM_FAULT_OOM=0, VM_FAULT_SIGBUS=1, VM_FAULT_MINOR=2, VM_FAULT_MAJOR=3
global VM_FAULT_NOPAGE=4, VM_FAULT_LOCKED=5, VM_FAULT_ERROR=6
global FAULT_FLAG_WRITE=1
/**
* sfunction vm_fault_contains - Test return value for page fault reason
*
* @value: the fault_type returned by vm.page_fault.return
* @test: the type of fault to test for (VM_FAULT_OOM or similar)
*/
function vm_fault_contains:long (value:long, test:long)
%{
int res;
switch (STAP_ARG_test){
case 0: res = STAP_ARG_value & VM_FAULT_OOM; break;
case 1: res = STAP_ARG_value & VM_FAULT_SIGBUS; break;
#if !defined(VM_FAULT_MINOR) || (defined(VM_FAULT_MINOR) && VM_FAULT_MINOR == 0)
case 2: /* VM_FAULT_MINOR infered by that flags off */
res = !((VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_MAJOR) &
STAP_ARG_value);
break;
#else
case 2: res = STAP_ARG_value == VM_FAULT_MINOR; break;
#endif
case 3: res = STAP_ARG_value & VM_FAULT_MAJOR; break;
#ifdef VM_FAULT_NOPAGE
case 4: res = STAP_ARG_value & VM_FAULT_NOPAGE; break;
#endif
#ifdef VM_FAULT_LOCKED
case 5: res = STAP_ARG_value & VM_FAULT_LOCKED; break;
#endif
#ifdef VM_FAULT_ERROR
case 6: res = STAP_ARG_value & VM_FAULT_ERROR; break;
#endif
default: res = 0; break;
}
STAP_RETVALUE = (res != 0);
return;
%}
/**
* probe vm.pagefault - Records that a page fault occurred
*
* @name: name of the probe point
* @address: the address of the faulting memory access; i.e. the address that caused the page fault
* @write_access: indicates whether this was a write or read access; 1 indicates a write,
* while 0 indicates a read
*
* Context: The process which triggered the fault
*/
probe vm.pagefault = kernel.function("handle_mm_fault@mm/memory.c").call !,
kernel.function("__handle_mm_fault@mm/memory.c").call
{
name = "pagefault"
write_access = (@defined($flags)
? $flags & FAULT_FLAG_WRITE : $write_access)
address = $address
}
/**
* probe vm.pagefault.return - Indicates what type of fault occurred
*
* @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.
*/
probe vm.pagefault.return =
kernel.function("handle_mm_fault@mm/memory.c").return !,
kernel.function("__handle_mm_fault@mm/memory.c").return
{
name = "pagefault"
fault_type = $return
}
/**
* sfunction addr_to_node - Returns which node a given address belongs to within a NUMA system
*
* @addr: the address of the faulting memory access
*
* Description: This function accepts an address, and returns the
* node that the given address belongs to in a NUMA system.
*/
function addr_to_node:long(addr:long) %{ /* pure */
int nid;
int pfn;
if (! virt_addr_valid((void*) (uintptr_t) STAP_ARG_addr)) {
snprintf (CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
"invalid kernel virtual address 0x%p", (void *) (uintptr_t) STAP_ARG_addr);
CONTEXT->last_error = CONTEXT->error_buffer;
goto out;
}
pfn = __pa(STAP_ARG_addr) >> PAGE_SHIFT;
#ifdef for_each_online_node
for_each_online_node(nid)
#else
for (nid=0; nid<MAX_NUMNODES; nid++)
if (NODE_DATA(nid)) /* approximately: if (node_online(nid)) */
#endif
if ( NODE_DATA(nid)->node_start_pfn <= pfn &&
pfn < (NODE_DATA(nid)->node_start_pfn +
NODE_DATA(nid)->node_spanned_pages) )
{
STAP_RETVALUE = nid;
break;
}
%}
// Return whether a page to be copied is a zero page.
@__private30 function _IS_ZERO_PAGE:long(from:long, vaddr:long) %{ /* pure */
STAP_RETVALUE = (STAP_ARG_from == (long) ZERO_PAGE(STAP_ARG_vaddr));
%}
/**
* probe vm.write_shared - Attempts at writing to a shared page
*
* @name: name of the probe point
* @address: the address of the shared write
*
* Context:
* The context is the process attempting the write.
*
* Fires when a process attempts to write to a shared page.
* If a copy is necessary, this will be followed by a
* vm.write_shared_copy.
*/
probe vm.write_shared = kernel.function("do_wp_page") {
name = "write_shared"
address = @choose_defined($vmf->address,$address)
}
/**
* probe vm.write_shared_copy - Page copy for shared page write
*
* @name: Name of the probe point
* @address: The address of the shared write
* @zero: boolean indicating whether it is a zero page
* (can do a clear instead of a copy)
*
* Context:
* The process attempting the write.
*
* Fires when a write to a shared page requires a page copy. This is
* always preceded by a vm.write_shared.
*/
probe vm.write_shared_copy = kernel.function("cow_user_page") ?,
kernel.function("copy_cow_page") ?
{
name = "write_shared_copy"
if (@defined($va)) {
address = $va
zero = _IS_ZERO_PAGE($src, $va);
} else {
address = $address
zero = _IS_ZERO_PAGE($from, $address);
}
}
/**
* probe vm.mmap - Fires when an mmap is requested
*
* @name: name of the probe point
* @address: the requested address
* @length: the length of the memory segment
*
* Context:
* The process calling mmap.
*/
probe vm.mmap = kernel.function("vm_mmap") !,
kernel.function("do_mmap_pgoff") !,
kernel.function("do_mmap") ?, kernel.function("do_mmap2") ?
{
name = "mmap"
address = $addr
length = $len
}
/**
* probe vm.munmap - Fires when an munmap is requested
*
* @name: name of the probe point
* @address: the requested address
* @length: the length of the memory segment
*
* Context:
* The process calling munmap.
*/
probe vm.munmap = kernel.function("do_munmap") {
name = "munmap"
address = $start
length = $len
}
/**
* probe vm.brk - Fires when a brk is requested (i.e. the heap will be resized)
*
* @name: name of the probe point
* @address: the requested address
* @length: the length of the memory segment
*
* Context:
* The process calling brk.
*/
probe vm.brk = kernel.function("do_brk_flags")!, kernel.function("do_brk") {
name = "brk"
address = $addr
length = $len
}
/**
* probe vm.oom_kill - Fires when a thread is selected for termination by the OOM killer
*
* @name: name of the probe point
* @task: the task being killed
*
* Context:
* The process that tried to consume excessive memory, and thus
* triggered the OOM.
*/
probe vm.oom_kill = kernel.function("oom_kill_process") !,
kernel.function("__oom_kill_task")
{
name = "oom_kill"
if (@defined($p)) {
task = $p
}
else {
task = $oc->chosen
}
}
@__private30 function GFP_KERNEL:long()
{
return @const("GFP_KERNEL")
}
@__private30 function __gfp_flag_str:string(gfp_flag:long)
%{
long gfp_flag = STAP_ARG_gfp_flag;
STAP_RETVALUE[0] = '\0';
/* Older kernels < 2.6.32 didn't have some of these GFP defines yet. */
#ifndef __GFP_DMA32
#define __GFP_DMA32 ((__force gfp_t)0x04u)
#endif
#ifndef GFP_DMA32
#define GFP_DMA32 __GFP_DMA32
#endif
#ifndef __GFP_MOVABLE
#define __GFP_MOVABLE ((__force gfp_t)0x08u) /* Page is movable */
#endif
#ifndef GFP_ZONEMASK
#define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE)
#endif
#ifndef __GFP_NOTRACK
#ifdef CONFIG_KMEMCHECK
#define __GFP_NOTRACK ((__force gfp_t)0x200000u) /* Don't track with kmemcheck */
#else
#define __GFP_NOTRACK ((__force gfp_t)0)
#endif
#endif
#ifndef __GFP_THISNODE
#define __GFP_THISNODE ((__force gfp_t)0x40000u)
#endif
#ifndef __GFP_RECLAIMABLE
#define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u)
#endif
#ifndef __GFP_ZERO
#define __GFP_ZERO ((__force gfp_t)0x8000u)
#endif
#ifndef __GFP_NOMEMALLOC
#define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u)
#endif
#ifndef __GFP_HARDWALL
#define __GFP_HARDWALL ((__force gfp_t)0x20000u)
#endif
#ifndef GFP_TEMPORARY
#define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \
__GFP_RECLAIMABLE)
#endif
#ifndef GFP_HIGHUSER_MOVABLE
#define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
__GFP_HARDWALL | __GFP_HIGHMEM | \
__GFP_MOVABLE)
#endif
#ifndef GFP_THISNODE
#ifdef CONFIG_NUMA
#define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
#else
#define GFP_THISNODE ((__force gfp_t)0)
#endif
#endif
/* Macro for GFP Bitmasks. */
/* The resulted GFP_FLAGS may be either single or concatenation of the multiple bitmasks. */
#define __GFP_BITMASKS(FLAG) if(gfp_flag & FLAG) { if(STAP_RETVALUE[0] != '\0') \
strlcat(STAP_RETVALUE, " | "#FLAG, MAXSTRINGLEN); \
else strlcat(STAP_RETVALUE, #FLAG, MAXSTRINGLEN); }
/* Macro for Composite Flags. */
/* Each Composite GFP_FLAG is the combination of multiple bitmasks. */
#define __GFP_COMPOSITE_FLAG(FLAG) if(gfp_flag == FLAG) { \
strlcat(STAP_RETVALUE, #FLAG, MAXSTRINGLEN); return; }
/* Composite GFP FLAGS of the BitMasks. */
__GFP_COMPOSITE_FLAG(GFP_ZONEMASK)
__GFP_COMPOSITE_FLAG(GFP_ATOMIC)
__GFP_COMPOSITE_FLAG(GFP_NOIO)
__GFP_COMPOSITE_FLAG(GFP_NOFS)
__GFP_COMPOSITE_FLAG(GFP_KERNEL)
__GFP_COMPOSITE_FLAG(GFP_TEMPORARY)
__GFP_COMPOSITE_FLAG(GFP_USER)
__GFP_COMPOSITE_FLAG(GFP_HIGHUSER)
__GFP_COMPOSITE_FLAG(GFP_HIGHUSER_MOVABLE)
__GFP_COMPOSITE_FLAG(GFP_THISNODE)
__GFP_COMPOSITE_FLAG(GFP_DMA)
__GFP_COMPOSITE_FLAG(GFP_DMA32)
/* GFP BitMasks */
__GFP_BITMASKS(__GFP_DMA)
__GFP_BITMASKS(__GFP_HIGHMEM)
__GFP_BITMASKS(__GFP_DMA32)
__GFP_BITMASKS(__GFP_MOVABLE)
__GFP_BITMASKS(__GFP_RECLAIMABLE)
#ifdef __GFP_WAIT
__GFP_BITMASKS(__GFP_WAIT)
#endif
__GFP_BITMASKS(__GFP_HIGH)
__GFP_BITMASKS(__GFP_IO)
__GFP_BITMASKS(__GFP_FS)
#ifdef __GFP_COLD
__GFP_BITMASKS(__GFP_COLD)
#endif
__GFP_BITMASKS(__GFP_NOWARN)
#ifdef __GFP_RETRY_MAYFAIL
__GFP_BITMASKS(__GFP_RETRY_MAYFAIL)
#endif
#ifdef __GFP_REPEAT
__GFP_BITMASKS(__GFP_REPEAT)
#endif
__GFP_BITMASKS(__GFP_NOFAIL)
#ifdef __GFP_NORETRY
__GFP_BITMASKS(__GFP_NORETRY)
#endif
#ifdef __GFP_MEMALLOC
__GFP_BITMASKS(__GFP_MEMALLOC)
#endif
__GFP_BITMASKS(__GFP_COMP)
__GFP_BITMASKS(__GFP_ZERO)
__GFP_BITMASKS(__GFP_NOMEMALLOC)
__GFP_BITMASKS(__GFP_HARDWALL)
__GFP_BITMASKS(__GFP_THISNODE)
#ifdef ___GFP_ATOMIC
__GFP_BITMASKS(__GFP_ATOMIC)
#endif
#ifdef ___GFP_ACCOUNT
__GFP_BITMASKS(__GFP_ACCOUNT)
#endif
__GFP_BITMASKS(__GFP_NOTRACK)
#ifdef ___GFP_DIRECT_RECLAIM
__GFP_BITMASKS(__GFP_DIRECT_RECLAIM)
#endif
#ifdef ___GFP_WRITE
__GFP_BITMASKS(__GFP_WRITE)
#endif
#ifdef ___GFP_KSWAPD_RECLAIM
__GFP_BITMASKS(__GFP_KSWAPD_RECLAIM)
#endif
#ifdef ___GFP_NOLOCKDEP
__GFP_BITMASKS(__GFP_NOLOCKDEP)
#endif
#undef __GFP_BITMASKS
#undef __GFP_COMPOSITE_FLAG
%}
/* The Formal Parameters will be displayed if available, otherwise \
"0" or "unknown" will be displayed */
probe __vm.kmalloc.tp = kernel.trace("kmalloc")
{
call_site = $call_site
caller_function = symname(call_site)
bytes_req = $bytes_req
bytes_alloc = $bytes_alloc
gfp_flags = $gfp_flags
gfp_flag_name = __gfp_flag_str($gfp_flags)
ptr = $ptr
}
/*
* It is unsafe to invoke __builtin_return_address() presently (to get
* call_site for kprobe based probes) and that it can be improved
* later when fix for bugs bz#6961 and bz#6580 is available.
*/
probe __vm.kmalloc.kp = kernel.function("kmem_cache_alloc_notrace").return !,
kernel.function("kmem_cache_alloc").return
{
call_site = 0
caller_function = "unknown"
// Note that 'bytes_req' could be wrong. By the time
// kmem_cache_alloc* gets called the requested size could have
// rounded up to the nearest cache alloc size.
if (@defined(@entry($s))) {
bytes_req = @entry($s->size)
bytes_alloc = bytes_req
}
else if (@defined(@entry($cachep->buffer_size))) {
bytes_req = @entry($cachep->buffer_size)
bytes_alloc = bytes_req
}
else {
bytes_req = @entry($cachep->objsize)
bytes_alloc = bytes_req
}
if (@defined(@entry($gfpflags))) {
gfp_flags = @entry($gfpflags)
gfp_flag_name = __gfp_flag_str(gfp_flags)
}
else {
gfp_flags = @entry($flags)
gfp_flag_name = __gfp_flag_str(gfp_flags)
}
ptr = $return
}
/**
* probe vm.kmalloc - Fires when kmalloc is requested
*
* @name: name of the probe point
* @call_site: address of the kmemory function
* @caller_function: name of the caller function
* @bytes_req: requested Bytes
* @bytes_alloc: allocated Bytes
* @gfp_flags: type of kmemory to allocate
* @gfp_flag_name: type of kmemory to allocate (in String format)
* @ptr: pointer to the kmemory allocated
*/
probe vm.kmalloc = __vm.kmalloc.tp !, __vm.kmalloc.kp
{
name = "kmalloc"
}
probe __vm.kmem_cache_alloc.tp = kernel.trace("kmem_cache_alloc")
{
call_site = $call_site
caller_function = symname(call_site)
bytes_req = $bytes_req
bytes_alloc = $bytes_alloc
gfp_flags = $gfp_flags
gfp_flag_name = __gfp_flag_str($gfp_flags)
ptr = $ptr
}
probe __vm.kmem_cache_alloc.kp = kernel.function("kmem_cache_alloc").return
{
call_site = 0
caller_function = "unknown"
// Note that 'bytes_req' could be wrong. By the time
// kmem_cache_alloc* gets called the requested size could have
// rounded up to the nearest cache alloc size.
if (@defined(@entry($s))) {
bytes_req = @entry($s->size)
bytes_alloc = bytes_req
}
else if (@defined(@entry($cachep->buffer_size))) {
bytes_req = @entry($cachep->buffer_size)
bytes_alloc = bytes_req
}
else {
bytes_req = @entry($cachep->objsize)
bytes_alloc = bytes_req
}
if (@defined(@entry($gfpflags))) {
gfp_flags = @entry($gfpflags)
gfp_flag_name = __gfp_flag_str(gfp_flags)
}
else {
gfp_flags = @entry($flags)
gfp_flag_name = __gfp_flag_str(gfp_flags)
}
ptr = $return
}
/**
* probe vm.kmem_cache_alloc - Fires when kmem_cache_alloc is requested
*
* @name: name of the probe point
* @call_site: address of the function calling this kmemory function.
* @caller_function: name of the caller function.
* @bytes_req: requested Bytes
* @bytes_alloc: allocated Bytes
* @gfp_flags: type of kmemory to allocate
* @gfp_flag_name: type of kmemory to allocate(in string format)
* @ptr: pointer to the kmemory allocated
*/
probe vm.kmem_cache_alloc = __vm.kmem_cache_alloc.tp !,
__vm.kmem_cache_alloc.kp
{
name = "kmem_cache_alloc"
}
probe __vm.kmalloc_node.tp = kernel.trace("kmalloc_node") ?
{
call_site = $call_site
caller_function = symname(call_site)
bytes_req = $bytes_req
bytes_alloc = $bytes_alloc
gfp_flags = $gfp_flags
gfp_flag_name = __gfp_flag_str($gfp_flags)
ptr = $ptr
}
probe __vm.kmalloc_node.kp = kernel.function("kmalloc_node").return ?
{
call_site = 0
caller_function = "unknown"
bytes_req = @entry($size)
bytes_alloc = bytes_req // pretend they are always the same
# Unfortunately, on i686 f11 (2.6.29.4-167.fc11.i686.PAE), we
# can't see the '$flags' argument (even though we can see the
# '$size' argument above). Note that we can see the '$flags'
# argument on x86_64 f11 (2.6.29.4-167.fc11.x86_64). So, the
# best we can do here is just use 0 when $flags isn't defined.
gfp_flags = @choose_defined(@entry($flags), 0)
gfp_flag_name = __gfp_flag_str(@choose_defined(@entry($flags), 0))
ptr = $return
}
/**
* probe vm.kmalloc_node - Fires when kmalloc_node is requested
*
* @name: name of the probe point
* @call_site: address of the function caling this kmemory function
* @caller_function: name of the caller function
* @bytes_req: requested Bytes
* @bytes_alloc: allocated Bytes
* @gfp_flags: type of kmemory to allocate
* @gfp_flag_name: type of kmemory to allocate(in string format)
* @ptr: pointer to the kmemory allocated
*/
probe vm.kmalloc_node = __vm.kmalloc_node.tp !, __vm.kmalloc_node.kp ?
{
name = "kmalloc_node"
}
probe __vm.kmem_cache_alloc_node.tp = kernel.trace("kmem_cache_alloc_node") ?
{
call_site = $call_site
caller_function = symname(call_site)
bytes_req = $bytes_req
bytes_alloc = $bytes_alloc
gfp_flags = $gfp_flags
gfp_flag_name = __gfp_flag_str($gfp_flags)
ptr = $ptr
}
probe __vm.kmem_cache_alloc_node.kp =
kernel.function("kmem_cache_alloc_node").return ?
{
call_site = 0
caller_function = "unknown"
// Note that 'bytes_req' could be wrong. By the time
// kmem_cache_alloc* gets called the requested size could have
// rounded up to the nearest cache alloc size.
if (@defined(@entry($s))) {
bytes_req = @entry($s->size)
bytes_alloc = bytes_req
}
else if (@defined(@entry($cachep->buffer_size))) {
bytes_req = @entry($cachep->buffer_size)
bytes_alloc = bytes_req
}
else {
bytes_req = @entry($cachep->objsize)
bytes_alloc = bytes_req
}
// kmem_cache_alloc_node() doesn't get a flags argument. But,
// internally it uses GFP_KERNEL().
gfp_flags = GFP_KERNEL()
gfp_flag_name = __gfp_flag_str(gfp_flags)
ptr = $return
}
/**
* probe vm.kmem_cache_alloc_node - Fires when kmem_cache_alloc_node is requested
*
* @name: name of the probe point
* @call_site: address of the function calling this kmemory function
* @caller_function: name of the caller function
* @bytes_req: requested Bytes
* @bytes_alloc: allocated Bytes
* @gfp_flags: type of kmemory to allocate
* @gfp_flag_name: type of kmemory to allocate(in string format)
* @ptr: pointer to the kmemory allocated
*/
probe vm.kmem_cache_alloc_node = __vm.kmem_cache_alloc_node.tp !,
__vm.kmem_cache_alloc_node.kp ?
{
name = "kmem_cache_alloc_node"
}
probe __vm.kfree.tp = kernel.trace("kfree")
{
call_site = $call_site
caller_function = symname(call_site)
ptr = $ptr
}
probe __vm.kfree.kp = kernel.function("kfree").return
{
call_site = 0
caller_function = "unknown"
ptr = @entry(@choose_defined($x, $objp))
}
/**
* probe vm.kfree - Fires when kfree is requested
*
* @name: name of the probe point
* @call_site: address of the function calling this kmemory function
* @caller_function: name of the caller function.
* @ptr: pointer to the kmemory allocated which is returned by kmalloc
*/
probe vm.kfree = __vm.kfree.tp !, __vm.kfree.kp
{
name = "kfree"
}
probe __vm.kmem_cache_free.tp = kernel.trace("kmem_cache_free")
{
call_site = $call_site
caller_function = symname(call_site)
ptr = $ptr
}
probe __vm.kmem_cache_free.kp = kernel.function("kmem_cache_free").return
{
call_site = 0
caller_function = "unknown"
ptr = @entry(@choose_defined($x, $objp))
}
/**
* probe vm.kmem_cache_free - Fires when kmem_cache_free is requested
*
* @name: Name of the probe point
* @call_site: Address of the function calling this kmemory function
* @caller_function: Name of the caller function.
* @ptr: Pointer to the kmemory allocated which is returned by kmem_cache
*/
probe vm.kmem_cache_free = __vm.kmem_cache_free.tp !, __vm.kmem_cache_free.kp
{
name = "kmem_cache_free"
}