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Subject[PATCH vmalloc] reduce purge_lock range and hold time of vmap_area_lock
Date
From: z00281421 <z00281421@notesmail.huawei.com>


Signed-off-by: z00281421 <z00281421@notesmail.huawei.com>
---
mm/vmalloc.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 91f44e7..e9c9c04 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -661,13 +661,18 @@ static void __purge_vmap_area_lazy(unsigned long *start, unsigned long *end,
if (nr || force_flush)
flush_tlb_kernel_range(*start, *end);

+ spin_unlock(&purge_lock);
+
if (nr) {
+ unsigned char batch = 0;
spin_lock(&vmap_area_lock);
- llist_for_each_entry_safe(va, n_va, valist, purge_list)
+ llist_for_each_entry_safe(va, n_va, valist, purge_list) {
__free_vmap_area(va);
+ if (!batch++)
+ cond_resched_lock(&vmap_area_lock);
+ }
spin_unlock(&vmap_area_lock);
}
- spin_unlock(&purge_lock);
}

/*
--
1.7.9.5
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