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'max_ptes_shared' specifies how many pages can be shared across multiple processes. Exceeding the number would block the collapse:: /sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_shared A higher value may increase memory footprint for some workloads. By default, at least half of pages has to be not shared. [colin.king@canonical.com: fix several spelling mistakes] Link: http://lkml.kernel.org/r/20200420084241.65433-1-colin.king@canonical.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Tested-by: Zi Yan <ziy@nvidia.com> Reviewed-by: William Kucharski <william.kucharski@oracle.com> Reviewed-by: Zi Yan <ziy@nvidia.com> Acked-by: Yang Shi <yang.shi@linux.alibaba.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Ralph Campbell <rcampbell@nvidia.com> Link: http://lkml.kernel.org/r/20200416160026.16538-9-kirill.shutemov@linux.intel.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
172 lines
4.5 KiB
C
172 lines
4.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM huge_memory
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#if !defined(__HUGE_MEMORY_H) || defined(TRACE_HEADER_MULTI_READ)
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#define __HUGE_MEMORY_H
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#include <linux/tracepoint.h>
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#define SCAN_STATUS \
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EM( SCAN_FAIL, "failed") \
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EM( SCAN_SUCCEED, "succeeded") \
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EM( SCAN_PMD_NULL, "pmd_null") \
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EM( SCAN_EXCEED_NONE_PTE, "exceed_none_pte") \
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EM( SCAN_EXCEED_SWAP_PTE, "exceed_swap_pte") \
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EM( SCAN_EXCEED_SHARED_PTE, "exceed_shared_pte") \
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EM( SCAN_PTE_NON_PRESENT, "pte_non_present") \
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EM( SCAN_PTE_UFFD_WP, "pte_uffd_wp") \
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EM( SCAN_PAGE_RO, "no_writable_page") \
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EM( SCAN_LACK_REFERENCED_PAGE, "lack_referenced_page") \
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EM( SCAN_PAGE_NULL, "page_null") \
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EM( SCAN_SCAN_ABORT, "scan_aborted") \
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EM( SCAN_PAGE_COUNT, "not_suitable_page_count") \
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EM( SCAN_PAGE_LRU, "page_not_in_lru") \
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EM( SCAN_PAGE_LOCK, "page_locked") \
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EM( SCAN_PAGE_ANON, "page_not_anon") \
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EM( SCAN_PAGE_COMPOUND, "page_compound") \
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EM( SCAN_ANY_PROCESS, "no_process_for_page") \
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EM( SCAN_VMA_NULL, "vma_null") \
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EM( SCAN_VMA_CHECK, "vma_check_failed") \
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EM( SCAN_ADDRESS_RANGE, "not_suitable_address_range") \
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EM( SCAN_SWAP_CACHE_PAGE, "page_swap_cache") \
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EM( SCAN_DEL_PAGE_LRU, "could_not_delete_page_from_lru")\
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EM( SCAN_ALLOC_HUGE_PAGE_FAIL, "alloc_huge_page_failed") \
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EM( SCAN_CGROUP_CHARGE_FAIL, "ccgroup_charge_failed") \
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EM( SCAN_TRUNCATED, "truncated") \
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EMe(SCAN_PAGE_HAS_PRIVATE, "page_has_private") \
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#undef EM
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#undef EMe
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#define EM(a, b) TRACE_DEFINE_ENUM(a);
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#define EMe(a, b) TRACE_DEFINE_ENUM(a);
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SCAN_STATUS
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#undef EM
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#undef EMe
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#define EM(a, b) {a, b},
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#define EMe(a, b) {a, b}
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TRACE_EVENT(mm_khugepaged_scan_pmd,
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TP_PROTO(struct mm_struct *mm, struct page *page, bool writable,
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int referenced, int none_or_zero, int status, int unmapped),
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TP_ARGS(mm, page, writable, referenced, none_or_zero, status, unmapped),
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TP_STRUCT__entry(
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__field(struct mm_struct *, mm)
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__field(unsigned long, pfn)
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__field(bool, writable)
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__field(int, referenced)
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__field(int, none_or_zero)
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__field(int, status)
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__field(int, unmapped)
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),
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TP_fast_assign(
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__entry->mm = mm;
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__entry->pfn = page ? page_to_pfn(page) : -1;
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__entry->writable = writable;
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__entry->referenced = referenced;
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__entry->none_or_zero = none_or_zero;
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__entry->status = status;
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__entry->unmapped = unmapped;
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),
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TP_printk("mm=%p, scan_pfn=0x%lx, writable=%d, referenced=%d, none_or_zero=%d, status=%s, unmapped=%d",
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__entry->mm,
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__entry->pfn,
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__entry->writable,
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__entry->referenced,
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__entry->none_or_zero,
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__print_symbolic(__entry->status, SCAN_STATUS),
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__entry->unmapped)
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);
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TRACE_EVENT(mm_collapse_huge_page,
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TP_PROTO(struct mm_struct *mm, int isolated, int status),
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TP_ARGS(mm, isolated, status),
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TP_STRUCT__entry(
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__field(struct mm_struct *, mm)
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__field(int, isolated)
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__field(int, status)
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),
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TP_fast_assign(
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__entry->mm = mm;
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__entry->isolated = isolated;
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__entry->status = status;
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),
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TP_printk("mm=%p, isolated=%d, status=%s",
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__entry->mm,
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__entry->isolated,
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__print_symbolic(__entry->status, SCAN_STATUS))
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);
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TRACE_EVENT(mm_collapse_huge_page_isolate,
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TP_PROTO(struct page *page, int none_or_zero,
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int referenced, bool writable, int status),
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TP_ARGS(page, none_or_zero, referenced, writable, status),
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TP_STRUCT__entry(
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__field(unsigned long, pfn)
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__field(int, none_or_zero)
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__field(int, referenced)
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__field(bool, writable)
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__field(int, status)
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),
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TP_fast_assign(
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__entry->pfn = page ? page_to_pfn(page) : -1;
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__entry->none_or_zero = none_or_zero;
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__entry->referenced = referenced;
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__entry->writable = writable;
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__entry->status = status;
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),
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TP_printk("scan_pfn=0x%lx, none_or_zero=%d, referenced=%d, writable=%d, status=%s",
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__entry->pfn,
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__entry->none_or_zero,
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__entry->referenced,
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__entry->writable,
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__print_symbolic(__entry->status, SCAN_STATUS))
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);
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TRACE_EVENT(mm_collapse_huge_page_swapin,
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TP_PROTO(struct mm_struct *mm, int swapped_in, int referenced, int ret),
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TP_ARGS(mm, swapped_in, referenced, ret),
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TP_STRUCT__entry(
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__field(struct mm_struct *, mm)
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__field(int, swapped_in)
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__field(int, referenced)
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__field(int, ret)
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),
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TP_fast_assign(
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__entry->mm = mm;
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__entry->swapped_in = swapped_in;
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__entry->referenced = referenced;
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__entry->ret = ret;
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),
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TP_printk("mm=%p, swapped_in=%d, referenced=%d, ret=%d",
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__entry->mm,
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__entry->swapped_in,
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__entry->referenced,
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__entry->ret)
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);
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#endif /* __HUGE_MEMORY_H */
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#include <trace/define_trace.h>
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