Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | From | Zi Yan <> | Subject | [RFC PATCH 24/31] sysctl: add an option to only print the head page virtual address. | Date | Fri, 15 Feb 2019 14:08:49 -0800 |
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From: Zi Yan <ziy@nvidia.com>
It can help distinguish between PUD-mapped, PMD-mapped THPs, and PTE-mapped THPs.
Signed-off-by: Zi Yan <ziy@nvidia.com> --- fs/proc/task_mmu.c | 7 +++++-- kernel/sysctl.c | 11 +++++++++++ 2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index ccf8ce760283..5106d5a07576 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -27,6 +27,9 @@ #define SEQ_PUT_DEC(str, val) \ seq_put_decimal_ull_width(m, str, (val) << (PAGE_SHIFT-10), 8) + +int only_print_head_pfn; + void task_mem(struct seq_file *m, struct mm_struct *mm) { unsigned long text, lib, swap, anon, file, shmem; @@ -1308,7 +1311,7 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, flags |= PM_SOFT_DIRTY; if (pm->show_pfn) frame = pmd_pfn(pmd) + - ((addr & ~PMD_MASK) >> PAGE_SHIFT); + (only_print_head_pfn?0:((addr & ~PMD_MASK) >> PAGE_SHIFT)); } #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION else if (is_swap_pmd(pmd)) { @@ -1394,7 +1397,7 @@ static int pagemap_pud_range(pud_t *pudp, unsigned long addr, unsigned long end, flags |= PM_SOFT_DIRTY; if (pm->show_pfn) frame = pud_pfn(pud) + - ((addr & ~PMD_MASK) >> PAGE_SHIFT); + (only_print_head_pfn?0:((addr & ~PUD_MASK) >> PAGE_SHIFT)); } if (page && page_mapcount(page) == 1) diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 6bf0be1af7e0..762535a2c7d1 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -122,6 +122,8 @@ extern int vma_no_repeat_defrag; extern int num_breakout_chunks; extern int defrag_size_threshold; +extern int only_print_head_pfn; + /* Constants used for minimum and maximum */ #ifdef CONFIG_LOCKUP_DETECTOR static int sixty = 60; @@ -1750,6 +1752,15 @@ static struct ctl_table vm_table[] = { .proc_handler = proc_dointvec_minmax, .extra1 = &zero, }, + { + .procname = "only_print_head_pfn", + .data = &only_print_head_pfn, + .maxlen = sizeof(only_print_head_pfn), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &zero, + .extra2 = &one, + }, { } }; -- 2.20.1
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