From: Kemeng Shi shikemeng@huawei.com
euleros inclusion category: feature feature: etmem bugzilla: https://gitee.com/openeuler/kernel/issues/I4OODH?from=project-issue CVE: NA
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Now, we will call cond_resched after scan a full memslot. If we scan a huge memslot, it will take long time before cond_resched. So call cond_resched after scan walk_step size memory.
Signed-off-by: Kemeng Shi shikemeng@huawei.com Reviewed-by: louhongxiang louhongxiang@huawei.com Reviewed-by: Chen Wandun chenwandun@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- fs/proc/etmem_scan.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/fs/proc/etmem_scan.c b/fs/proc/etmem_scan.c index e4f5664e4c89..382a87027950 100644 --- a/fs/proc/etmem_scan.c +++ b/fs/proc/etmem_scan.c @@ -106,6 +106,9 @@ static struct kernel_param_ops walk_step_ops = { static unsigned int __read_mostly walk_step = 512; // in PAGE_SIZE module_param_cb(walk_step, &walk_step_ops, &walk_step, 0644);
+static unsigned int resched_step = 10; +module_param(resched_step, uint, 0644); + static unsigned long pagetype_size[16] = { [PTE_ACCESSED] = PAGE_SIZE, /* 4k page */ [PMD_ACCESSED] = PMD_SIZE, /* 2M page */ @@ -836,6 +839,7 @@ static int vm_idle_walk_hva_range(struct page_idle_ctrl *pic, unsigned long addr_range; unsigned long va_end; int ret; + int steps;
#ifdef CONFIG_X86_64 ret = ept_idle_supports_cpu(pic->kvm); @@ -863,6 +867,7 @@ static int vm_idle_walk_hva_range(struct page_idle_ctrl *pic, } else { pic->gpa_to_hva = start - gpa_addr; gpa_end = gpa_addr + addr_range; + steps = 0; for (; gpa_addr < gpa_end;) { gpa_next = min(gpa_end, gpa_addr + walk_step * PAGE_SIZE); #ifdef CONFIG_ARM64 @@ -874,6 +879,11 @@ static int vm_idle_walk_hva_range(struct page_idle_ctrl *pic,
if (ret) break; + + if (++steps >= resched_step) { + cond_resched(); + steps = 0; + } } va_end = pic->gpa_to_hva + gpa_end; }