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powerpc/thp: Add tracepoints to track hugepage invalidate 

Add tracepoint to track hugepage invalidate. This help us
in debugging difficult to track bugs.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Aneesh Kumar K.V 2014-08-13 12:32:04 +05:30 committed by Benjamin Herrenschmidt
parent 85c1fafd72
commit 9e813308a5
3 changed files with 98 additions and 0 deletions
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6
arch/powerpc/mm/pgtable_64.c
View File

@ -54,6 +54,9 @@
#include "mmu_decl.h"
#define CREATE_TRACE_POINTS
#include <trace/events/thp.h>
/* Some sanity checking */
#if TASK_SIZE_USER64 > PGTABLE_RANGE
#error TASK_SIZE_USER64 exceeds pagetable range
@ -537,6 +540,7 @@ unsigned long pmd_hugepage_update(struct mm_struct *mm, unsigned long addr,
old = pmd_val(*pmdp);
*pmdp = __pmd((old & ~clr) | set);
#endif
trace_hugepage_update(addr, old, clr, set);
if (old & _PAGE_HASHPTE)
hpte_do_hugepage_flush(mm, addr, pmdp, old);
return old;
@ -642,6 +646,7 @@ void pmdp_splitting_flush(struct vm_area_struct *vma,
* If we didn't had the splitting flag set, go and flush the
* HPTE entries.
*/
trace_hugepage_splitting(address, old);
if (!(old & _PAGE_SPLITTING)) {
/* We need to flush the hpte */
if (old & _PAGE_HASHPTE)
@ -709,6 +714,7 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr,
assert_spin_locked(&mm->page_table_lock);
WARN_ON(!pmd_trans_huge(pmd));
#endif
trace_hugepage_set_pmd(addr, pmd);
return set_pte_at(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd));
}

4
arch/powerpc/mm/tlb_hash64.c
View File

@ -30,6 +30,8 @@
#include <asm/tlb.h>
#include <asm/bug.h>
#include <trace/events/thp.h>
DEFINE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
/*
@ -213,6 +215,8 @@ void __flush_hash_table_range(struct mm_struct *mm, unsigned long start,
if (ptep == NULL)
continue;
pte = pte_val(*ptep);
if (hugepage_shift)
trace_hugepage_invalidate(start, pte_val(pte));
if (!(pte & _PAGE_HASHPTE))
continue;
if (unlikely(hugepage_shift && pmd_trans_huge(*(pmd_t *)pte)))

88
include/trace/events/thp.h Normal file
View File

@ -0,0 +1,88 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM thp
#if !defined(_TRACE_THP_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_THP_H
#include <linux/types.h>
#include <linux/tracepoint.h>
TRACE_EVENT(hugepage_invalidate,
TP_PROTO(unsigned long addr, unsigned long pte),
TP_ARGS(addr, pte),
TP_STRUCT__entry(
__field(unsigned long, addr)
__field(unsigned long, pte)
),
TP_fast_assign(
__entry->addr = addr;
__entry->pte = pte;
),
TP_printk("hugepage invalidate at addr 0x%lx and pte = 0x%lx",
__entry->addr, __entry->pte)
);
TRACE_EVENT(hugepage_set_pmd,
TP_PROTO(unsigned long addr, unsigned long pmd),
TP_ARGS(addr, pmd),
TP_STRUCT__entry(
__field(unsigned long, addr)
__field(unsigned long, pmd)
),
TP_fast_assign(
__entry->addr = addr;
__entry->pmd = pmd;
),
TP_printk("Set pmd with 0x%lx with 0x%lx", __entry->addr, __entry->pmd)
);
TRACE_EVENT(hugepage_update,
TP_PROTO(unsigned long addr, unsigned long pte, unsigned long clr, unsigned long set),
TP_ARGS(addr, pte, clr, set),
TP_STRUCT__entry(
__field(unsigned long, addr)
__field(unsigned long, pte)
__field(unsigned long, clr)
__field(unsigned long, set)
),
TP_fast_assign(
__entry->addr = addr;
__entry->pte = pte;
__entry->clr = clr;
__entry->set = set;
),
TP_printk("hugepage update at addr 0x%lx and pte = 0x%lx clr = 0x%lx, set = 0x%lx", __entry->addr, __entry->pte, __entry->clr, __entry->set)
);
TRACE_EVENT(hugepage_splitting,
TP_PROTO(unsigned long addr, unsigned long pte),
TP_ARGS(addr, pte),
TP_STRUCT__entry(
__field(unsigned long, addr)
__field(unsigned long, pte)
),
TP_fast_assign(
__entry->addr = addr;
__entry->pte = pte;
),
TP_printk("hugepage splitting at addr 0x%lx and pte = 0x%lx",
__entry->addr, __entry->pte)
);
#endif /* _TRACE_THP_H */
/* This part must be outside protection */
#include <trace/define_trace.h>