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// memory/vm related tapset
// Copyright (C) 2005, 2006 IBM Corp.
// Copyright (C) 2006 Intel Corporation.
//
// 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.
/* probe vm.pagefault
*
* Records that a page fault occurred.
*
* Context:
* The process which triggered the fault.
*
* Arguments:
* address - the address of the faulting memory access.
* write_access - indicates whether this was a write
*/
probe vm.pagefault = kernel.function(
%( kernel_v >= "2.6.13" %? "__handle_mm_fault" %: "handle_mm_fault" %)
)
{
write_access = $write_access
address = $address
}
/* Return which node the given address belongs to in a NUMA system */
function addr_to_node:long(addr:long) /* pure */
%{
int nid;
int pfn = __pa(THIS->addr) >> PAGE_SHIFT;
for_each_online_node(nid)
if ( node_start_pfn(nid) <= pfn &&
pfn < (node_start_pfn(nid) +
NODE_DATA(nid)->node_spanned_pages) )
{
THIS->__retvalue = nid;
break;
}
%}
/* Return whether a page to be copied is a zero page. */
function _IS_ZERO_PAGE:long(from:long, vaddr:long) %{ /* pure */
THIS->__retvalue = (from == ZERO_PAGE(vaddr));
%}
/* probe vm.write_shared
*
* 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.
*
* Context:
* The process attempting the write.
*
* Arguments:
* address - the address of the shared write.
*/
probe vm.write_shared = kernel.function("do_wp_page") {
address = $address
}
/* probe vm.write_shared_copy
*
* Fires when a write to a shared page requires a page copy. This is
* always preceded by a vm.shared_write.
*
* Context:
* The process attempting the write.
*
* Arguments:
* address - the address of the shared write.
* zero - boolean indicating whether it is a zero page
* (can do a clear instead of a copy).
*/
probe vm.write_shared_copy = kernel.inline("copy_cow_page")? {
address = $address
zero = _IS_ZERO_PAGE($from, address);
}
/* probe vm.mmap
*
* Fires when an mmap is requested.
*
* Context:
* The process calling mmap.
*
* Arguments:
* address - the requested address
* length - the length of the memory segment
*/
probe vm.mmap = kernel.inline("do_mmap"), kernel.inline("do_mmap2")? {
address = $addr
length = $len
}
/* probe vm.munmap
*
* Fires when an munmap is requested.
*
* Context:
* The process calling munmap.
*
* Arguments:
* address - the requested address
* length - the length of the memory segment
*/
probe vm.munmap = kernel.function("do_munmap") {
address = $start
length = $len
}
/* probe vm.brk
*
* Fires when a brk is requested (resizing a heap).
*
* Context:
* The process calling brk.
*
* Arguments:
* address - the requested address
* length - the length of the memory segment
*/
probe vm.brk = kernel.function("do_brk") {
address = $addr
length = $len
}
/* probe vm.oom_kill
*
* Fires when a thread is targetted by the OOM killer.
*
* Context:
* The process that tried to consume more memory, and thus
* triggered the OOM. (correct?)
*
* Arguments:
* task - the task being killed
*/
probe vm.oom_kill = kernel.function("__oom_kill_task") {
task = $p
}
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