--- /dev/null
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM huge_memory
+
+#if !defined(__HUGE_MEMORY_H) || defined(TRACE_HEADER_MULTI_READ)
+#define __HUGE_MEMORY_H
+
+#include <linux/tracepoint.h>
+
+#include <trace/events/gfpflags.h>
+
+#define SCAN_STATUS \
+ EM( SCAN_FAIL, "failed") \
+ EM( SCAN_SUCCEED, "succeeded") \
+ EM( SCAN_PMD_NULL, "pmd_null") \
+ EM( SCAN_EXCEED_NONE_PTE, "exceed_none_pte") \
+ EM( SCAN_PTE_NON_PRESENT, "pte_non_present") \
+ EM( SCAN_PAGE_RO, "no_writable_page") \
+ EM( SCAN_NO_REFERENCED_PAGE, "no_referenced_page") \
+ EM( SCAN_PAGE_NULL, "page_null") \
+ EM( SCAN_SCAN_ABORT, "scan_aborted") \
+ EM( SCAN_PAGE_COUNT, "not_suitable_page_count") \
+ EM( SCAN_PAGE_LRU, "page_not_in_lru") \
+ EM( SCAN_PAGE_LOCK, "page_locked") \
+ EM( SCAN_PAGE_ANON, "page_not_anon") \
+ EM( SCAN_ANY_PROCESS, "no_process_for_page") \
+ EM( SCAN_VMA_NULL, "vma_null") \
+ EM( SCAN_VMA_CHECK, "vma_check_failed") \
+ EM( SCAN_ADDRESS_RANGE, "not_suitable_address_range") \
+ EM( SCAN_SWAP_CACHE_PAGE, "page_swap_cache") \
+ EM( SCAN_DEL_PAGE_LRU, "could_not_delete_page_from_lru")\
+ EM( SCAN_ALLOC_HUGE_PAGE_FAIL, "alloc_huge_page_failed") \
+ EMe( SCAN_CGROUP_CHARGE_FAIL, "ccgroup_charge_failed")
+
+#undef EM
+#undef EMe
+#define EM(a, b) TRACE_DEFINE_ENUM(a);
+#define EMe(a, b) TRACE_DEFINE_ENUM(a);
+
+SCAN_STATUS
+
+#undef EM
+#undef EMe
+#define EM(a, b) {a, b},
+#define EMe(a, b) {a, b}
+
+TRACE_EVENT(mm_khugepaged_scan_pmd,
+
+ TP_PROTO(struct mm_struct *mm, unsigned long pfn, bool writable,
+ bool referenced, int none_or_zero, int status),
+
+ TP_ARGS(mm, pfn, writable, referenced, none_or_zero, status),
+
+ TP_STRUCT__entry(
+ __field(struct mm_struct *, mm)
+ __field(unsigned long, pfn)
+ __field(bool, writable)
+ __field(bool, referenced)
+ __field(int, none_or_zero)
+ __field(int, status)
+ ),
+
+ TP_fast_assign(
+ __entry->mm = mm;
+ __entry->pfn = pfn;
+ __entry->writable = writable;
+ __entry->referenced = referenced;
+ __entry->none_or_zero = none_or_zero;
+ __entry->status = status;
+ ),
+
+ TP_printk("mm=%p, scan_pfn=0x%lx, writable=%d, referenced=%d, none_or_zero=%d, status=%s",
+ __entry->mm,
+ __entry->pfn,
+ __entry->writable,
+ __entry->referenced,
+ __entry->none_or_zero,
+ __print_symbolic(__entry->status, SCAN_STATUS))
+);
+
+TRACE_EVENT(mm_collapse_huge_page,
+
+ TP_PROTO(struct mm_struct *mm, int isolated, int status),
+
+ TP_ARGS(mm, isolated, status),
+
+ TP_STRUCT__entry(
+ __field(struct mm_struct *, mm)
+ __field(int, isolated)
+ __field(int, status)
+ ),
+
+ TP_fast_assign(
+ __entry->mm = mm;
+ __entry->isolated = isolated;
+ __entry->status = status;
+ ),
+
+ TP_printk("mm=%p, isolated=%d, status=%s",
+ __entry->mm,
+ __entry->isolated,
+ __print_symbolic(__entry->status, SCAN_STATUS))
+);
+
+TRACE_EVENT(mm_collapse_huge_page_isolate,
+
+ TP_PROTO(unsigned long pfn, int none_or_zero,
+ bool referenced, bool writable, int status),
+
+ TP_ARGS(pfn, none_or_zero, referenced, writable, status),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, pfn)
+ __field(int, none_or_zero)
+ __field(bool, referenced)
+ __field(bool, writable)
+ __field(int, status)
+ ),
+
+ TP_fast_assign(
+ __entry->pfn = pfn;
+ __entry->none_or_zero = none_or_zero;
+ __entry->referenced = referenced;
+ __entry->writable = writable;
+ __entry->status = status;
+ ),
+
+ TP_printk("scan_pfn=0x%lx, none_or_zero=%d, referenced=%d, writable=%d, status=%s",
+ __entry->pfn,
+ __entry->none_or_zero,
+ __entry->referenced,
+ __entry->writable,
+ __print_symbolic(__entry->status, SCAN_STATUS))
+);
+
+#endif /* __HUGE_MEMORY_H */
+#include <trace/define_trace.h>
#include <asm/pgalloc.h>
#include "internal.h"
+enum scan_result {
+ SCAN_FAIL,
+ SCAN_SUCCEED,
+ SCAN_PMD_NULL,
+ SCAN_EXCEED_NONE_PTE,
+ SCAN_PTE_NON_PRESENT,
+ SCAN_PAGE_RO,
+ SCAN_NO_REFERENCED_PAGE,
+ SCAN_PAGE_NULL,
+ SCAN_SCAN_ABORT,
+ SCAN_PAGE_COUNT,
+ SCAN_PAGE_LRU,
+ SCAN_PAGE_LOCK,
+ SCAN_PAGE_ANON,
+ SCAN_ANY_PROCESS,
+ SCAN_VMA_NULL,
+ SCAN_VMA_CHECK,
+ SCAN_ADDRESS_RANGE,
+ SCAN_SWAP_CACHE_PAGE,
+ SCAN_DEL_PAGE_LRU,
+ SCAN_ALLOC_HUGE_PAGE_FAIL,
+ SCAN_CGROUP_CHARGE_FAIL
+};
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/huge_memory.h>
+
/*
* By default transparent hugepage support is disabled in order that avoid
* to risk increase the memory footprint of applications without a guaranteed
unsigned long address,
pte_t *pte)
{
- struct page *page;
+ struct page *page = NULL;
pte_t *_pte;
- int none_or_zero = 0;
+ int none_or_zero = 0, result = 0;
bool referenced = false, writable = false;
+
for (_pte = pte; _pte < pte+HPAGE_PMD_NR;
_pte++, address += PAGE_SIZE) {
pte_t pteval = *_pte;
if (pte_none(pteval) || (pte_present(pteval) &&
is_zero_pfn(pte_pfn(pteval)))) {
if (!userfaultfd_armed(vma) &&
- ++none_or_zero <= khugepaged_max_ptes_none)
+ ++none_or_zero <= khugepaged_max_ptes_none) {
continue;
- else
+ } else {
+ result = SCAN_EXCEED_NONE_PTE;
goto out;
+ }
}
- if (!pte_present(pteval))
+ if (!pte_present(pteval)) {
+ result = SCAN_PTE_NON_PRESENT;
goto out;
+ }
page = vm_normal_page(vma, address, pteval);
- if (unlikely(!page))
+ if (unlikely(!page)) {
+ result = SCAN_PAGE_NULL;
goto out;
+ }
VM_BUG_ON_PAGE(PageCompound(page), page);
VM_BUG_ON_PAGE(!PageAnon(page), page);
* is needed to serialize against split_huge_page
* when invoked from the VM.
*/
- if (!trylock_page(page))
+ if (!trylock_page(page)) {
+ result = SCAN_PAGE_LOCK;
goto out;
+ }
/*
* cannot use mapcount: can't collapse if there's a gup pin.
*/
if (page_count(page) != 1 + !!PageSwapCache(page)) {
unlock_page(page);
+ result = SCAN_PAGE_COUNT;
goto out;
}
if (pte_write(pteval)) {
} else {
if (PageSwapCache(page) && !reuse_swap_page(page)) {
unlock_page(page);
+ result = SCAN_SWAP_CACHE_PAGE;
goto out;
}
/*
*/
if (isolate_lru_page(page)) {
unlock_page(page);
+ result = SCAN_DEL_PAGE_LRU;
goto out;
}
/* 0 stands for page_is_file_cache(page) == false */
mmu_notifier_test_young(vma->vm_mm, address))
referenced = true;
}
- if (likely(referenced && writable))
- return 1;
+ if (likely(writable)) {
+ if (likely(referenced)) {
+ result = SCAN_SUCCEED;
+ trace_mm_collapse_huge_page_isolate(page_to_pfn(page), none_or_zero,
+ referenced, writable, result);
+ return 1;
+ }
+ } else {
+ result = SCAN_PAGE_RO;
+ }
+
out:
release_pte_pages(pte, _pte);
+ trace_mm_collapse_huge_page_isolate(page_to_pfn(page), none_or_zero,
+ referenced, writable, result);
return 0;
}
pgtable_t pgtable;
struct page *new_page;
spinlock_t *pmd_ptl, *pte_ptl;
- int isolated;
+ int isolated, result = 0;
unsigned long hstart, hend;
struct mem_cgroup *memcg;
unsigned long mmun_start; /* For mmu_notifiers */
/* release the mmap_sem read lock. */
new_page = khugepaged_alloc_page(hpage, gfp, mm, address, node);
- if (!new_page)
- return;
+ if (!new_page) {
+ result = SCAN_ALLOC_HUGE_PAGE_FAIL;
+ goto out_nolock;
+ }
- if (unlikely(mem_cgroup_try_charge(new_page, mm,
- gfp, &memcg)))
- return;
+ if (unlikely(mem_cgroup_try_charge(new_page, mm, gfp, &memcg))) {
+ result = SCAN_CGROUP_CHARGE_FAIL;
+ goto out_nolock;
+ }
/*
* Prevent all access to pagetables with the exception of
* handled by the anon_vma lock + PG_lock.
*/
down_write(&mm->mmap_sem);
- if (unlikely(khugepaged_test_exit(mm)))
+ if (unlikely(khugepaged_test_exit(mm))) {
+ result = SCAN_ANY_PROCESS;
goto out;
+ }
vma = find_vma(mm, address);
- if (!vma)
+ if (!vma) {
+ result = SCAN_VMA_NULL;
goto out;
+ }
hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK;
hend = vma->vm_end & HPAGE_PMD_MASK;
- if (address < hstart || address + HPAGE_PMD_SIZE > hend)
+ if (address < hstart || address + HPAGE_PMD_SIZE > hend) {
+ result = SCAN_ADDRESS_RANGE;
goto out;
- if (!hugepage_vma_check(vma))
+ }
+ if (!hugepage_vma_check(vma)) {
+ result = SCAN_VMA_CHECK;
goto out;
+ }
pmd = mm_find_pmd(mm, address);
- if (!pmd)
+ if (!pmd) {
+ result = SCAN_PMD_NULL;
goto out;
+ }
anon_vma_lock_write(vma->anon_vma);
pmd_populate(mm, pmd, pmd_pgtable(_pmd));
spin_unlock(pmd_ptl);
anon_vma_unlock_write(vma->anon_vma);
+ result = SCAN_FAIL;
goto out;
}
*hpage = NULL;
khugepaged_pages_collapsed++;
+ result = SCAN_SUCCEED;
out_up_write:
up_write(&mm->mmap_sem);
+ trace_mm_collapse_huge_page(mm, isolated, result);
return;
+out_nolock:
+ trace_mm_collapse_huge_page(mm, isolated, result);
+ return;
out:
mem_cgroup_cancel_charge(new_page, memcg);
goto out_up_write;
{
pmd_t *pmd;
pte_t *pte, *_pte;
- int ret = 0, none_or_zero = 0;
- struct page *page;
+ int ret = 0, none_or_zero = 0, result = 0;
+ struct page *page = NULL;
unsigned long _address;
spinlock_t *ptl;
int node = NUMA_NO_NODE;
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
pmd = mm_find_pmd(mm, address);
- if (!pmd)
+ if (!pmd) {
+ result = SCAN_PMD_NULL;
goto out;
+ }
memset(khugepaged_node_load, 0, sizeof(khugepaged_node_load));
pte = pte_offset_map_lock(mm, pmd, address, &ptl);
pte_t pteval = *_pte;
if (pte_none(pteval) || is_zero_pfn(pte_pfn(pteval))) {
if (!userfaultfd_armed(vma) &&
- ++none_or_zero <= khugepaged_max_ptes_none)
+ ++none_or_zero <= khugepaged_max_ptes_none) {
continue;
- else
+ } else {
+ result = SCAN_EXCEED_NONE_PTE;
goto out_unmap;
+ }
}
- if (!pte_present(pteval))
+ if (!pte_present(pteval)) {
+ result = SCAN_PTE_NON_PRESENT;
goto out_unmap;
+ }
if (pte_write(pteval))
writable = true;
page = vm_normal_page(vma, _address, pteval);
- if (unlikely(!page))
+ if (unlikely(!page)) {
+ result = SCAN_PAGE_NULL;
goto out_unmap;
+ }
/*
* Record which node the original page is from and save this
* information to khugepaged_node_load[].
* hit record.
*/
node = page_to_nid(page);
- if (khugepaged_scan_abort(node))
+ if (khugepaged_scan_abort(node)) {
+ result = SCAN_SCAN_ABORT;
goto out_unmap;
+ }
khugepaged_node_load[node]++;
VM_BUG_ON_PAGE(PageCompound(page), page);
- if (!PageLRU(page) || PageLocked(page) || !PageAnon(page))
+ if (!PageLRU(page)) {
+ result = SCAN_SCAN_ABORT;
+ goto out_unmap;
+ }
+ if (PageLocked(page)) {
+ result = SCAN_PAGE_LOCK;
+ goto out_unmap;
+ }
+ if (!PageAnon(page)) {
+ result = SCAN_PAGE_ANON;
goto out_unmap;
+ }
+
/*
* cannot use mapcount: can't collapse if there's a gup pin.
* The page must only be referenced by the scanned process
* and page swap cache.
*/
- if (page_count(page) != 1 + !!PageSwapCache(page))
+ if (page_count(page) != 1 + !!PageSwapCache(page)) {
+ result = SCAN_PAGE_COUNT;
goto out_unmap;
+ }
if (pte_young(pteval) ||
page_is_young(page) || PageReferenced(page) ||
mmu_notifier_test_young(vma->vm_mm, address))
referenced = true;
}
- if (referenced && writable)
- ret = 1;
+ if (writable) {
+ if (referenced) {
+ result = SCAN_SUCCEED;
+ ret = 1;
+ } else {
+ result = SCAN_NO_REFERENCED_PAGE;
+ }
+ } else {
+ result = SCAN_PAGE_RO;
+ }
out_unmap:
pte_unmap_unlock(pte, ptl);
if (ret) {
collapse_huge_page(mm, address, hpage, vma, node);
}
out:
+ trace_mm_khugepaged_scan_pmd(mm, page_to_pfn(page), writable, referenced,
+ none_or_zero, result);
return ret;
}
projects / cascardo / linux.git / commitdiff