34 lines
884 B
Plaintext
34 lines
884 B
Plaintext
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From: andrea@suse.de
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Subject: low-latency stuff
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Patch-mainline: not yet
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My point is that preempt and no-preempt should do the same thing there,
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otherwise when you benchmark -preempt, you'll get better latency,
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but not because of the preempt feature, but just because of unrelated
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latency improvements that have nothing to do with preempt.
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---
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mm/memory.c | 8 ++++----
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1 file changed, 4 insertions(+), 4 deletions(-)
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--- a/mm/memory.c
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+++ b/mm/memory.c
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@@ -1061,11 +1061,11 @@ static unsigned long unmap_page_range(st
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return addr;
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}
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-#ifdef CONFIG_PREEMPT
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-# define ZAP_BLOCK_SIZE (8 * PAGE_SIZE)
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+#ifdef CONFIG_SMP
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+/* zap one pte page at a time */
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+#define ZAP_BLOCK_SIZE (FREE_PTE_NR * PAGE_SIZE)
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#else
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-/* No preempt: go for improved straight-line efficiency */
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-# define ZAP_BLOCK_SIZE (1024 * PAGE_SIZE)
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+#define ZAP_BLOCK_SIZE (253 * PAGE_SIZE)
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#endif
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/**
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