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| author | William Cohen <wcohen@redhat.com> | 2009-02-12 15:58:24 -0500 |
|---|---|---|
| committer | William Cohen <wcohen@redhat.com> | 2009-02-12 16:00:20 -0500 |
| commit | 413996e0c3b55047e12272678627f7833228d892 (patch) | |
| tree | bbf169e936cc2e9d4b48f34f9609fa40ff3df1bc /tapset | |
| parent | 8df79eb6046f2fa2e1aed736b2adac4eaaf3a2f5 (diff) | |
| download | systemtap-steved-413996e0c3b55047e12272678627f7833228d892.tar.gz systemtap-steved-413996e0c3b55047e12272678627f7833228d892.tar.xz systemtap-steved-413996e0c3b55047e12272678627f7833228d892.zip | |
Function to determine page fault type and have pfaults.stp exercise it.
Diffstat (limited to 'tapset')
| -rw-r--r-- | tapset/ChangeLog | 4 | ||||
| -rw-r--r-- | tapset/memory.stp | 43 |
2 files changed, 47 insertions, 0 deletions
diff --git a/tapset/ChangeLog b/tapset/ChangeLog index 1aebe30c..b0ce6200 100644 --- a/tapset/ChangeLog +++ b/tapset/ChangeLog @@ -1,3 +1,7 @@ +2009-02-12 Will Cohen <wcohen@redhat.com> + + * memory.stp (VM_FAULT_*, function vm_fault_contains): New. + 2009-02-09 Josh Stone <jistone@redhat.com> * process.stp (process.create): Read the task pid *after* diff --git a/tapset/memory.stp b/tapset/memory.stp index 2d7f8b0c..961cca38 100644 --- a/tapset/memory.stp +++ b/tapset/memory.stp @@ -6,6 +6,49 @@ // 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. +%{ +#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 + +/** + * 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; +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) + switch (THIS->test){ + case 0: res = THIS->value == VM_FAULT_OOM; break; + case 1: res = THIS->value == VM_FAULT_SIGBUS; break; + case 2: res = THIS->value == VM_FAULT_MINOR; break; + case 3: res = THIS->value == VM_FAULT_MAJOR; break; + default: + res = 0; break; + } +#else + switch (THIS->test){ + case 0: res = THIS->value & VM_FAULT_OOM; break; + case 1: res = THIS->value & VM_FAULT_SIGBUS; break; + case 2: /* VM_FAULT_MINOR infered by that flags off */ + res = !((VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_MAJOR) & + THIS->value); + break; + case 3: res = THIS->value & VM_FAULT_MAJOR; break; + case 4: res = THIS->value & VM_FAULT_NOPAGE; break; + case 5: res = THIS->value & VM_FAULT_LOCKED; break; + case 6: res = THIS->value & VM_FAULT_ERROR; break; + default: + res = 0; + } +#endif + THIS->__retvalue = (res != 0); + return; +%} /** * probe vm.pagefault - Records that a page fault occurred. |