From dea9579e14552750b64aa782d2de8b8fe2453cde Mon Sep 17 00:00:00 2001
From: Mel Gorman <mgorman@suse.de>
Date: Fri, 1 Jun 2018 10:13:00 +0100
Subject: [PATCH] mremap: Remove LATENCY_LIMIT from mremap to reduce the number
of TLB shootdowns
Patch-mainline: v4.18-rc1
Git-commit: 37a4094e828f3c7673aa9c60f8b2b9d1019db81b
References: bnc#1095155
Commit 5d1904204c99 ("mremap: fix race between mremap() and page cleanning")
fixed races between mremap and other operations for both file-backed and
anonymous mappings. The file-backed was the most critical as it allowed the
possibility that data could be changed on a physical page after page_mkclean
returned which could trigger data loss or data integrity issues. A customer
reported that the cost of the TLBs for anonymous regressions was excessive
and resulting in a 30-50% drop in performance overall since this commit
on a microbenchmark. Unfortunately I neither have access to the test-case
nor can I describe what it does other than saying that mremap operations
dominate heavily.
This patch removes the LATENCY_LIMIT to handle TLB flushes on a PMD boundary
instead of every 64 pages to reduce the number of TLB shootdowns by a factor
of 8 in the ideal case. LATENCY_LIMIT was originally used to limit the PTL
hold times but the latency savings are likely offset by the cost of IPIs.
This patch is not reported to completely restore performance but gets it
within an acceptable percentage. The given metric here is simply described
as "higher is better".
Baseline that was known good
002: Metric: 91.05
004: Metric: 109.45
008: Metric: 73.08
016: Metric: 58.14
032: Metric: 61.09
064: Metric: 57.76
128: Metric: 55.43
Current
001: Metric: 54.98
002: Metric: 56.56
004: Metric: 41.22
008: Metric: 35.96
016: Metric: 36.45
032: Metric: 35.71
064: Metric: 35.73
128: Metric: 34.96
With patch
001: Metric: 61.43
002: Metric: 81.64
004: Metric: 67.92
008: Metric: 51.67
016: Metric: 50.47
032: Metric: 52.29
064: Metric: 50.01
128: Metric: 49.04
So for low threads, it's not restored but for larger number of threads,
it's closer to the "known good" baseline.
Using a different mremap-intensive workload that is not representative of
the real workload there is little difference observed outside of noise in
the headline metrics However, the TLB shootdowns are reduced by 11% on
average and at the peak, TLB shootdowns were reduced by 21%. Interrupts
were sampled every second while the workload ran to get those figures.
It's known that the figures will vary as the non-representative load is
non-deterministic.
An alternative patch was posted that should have significantly reduced the
TLB flushes but unfortunately it does not perform as well as this version
on the customer test case. If revisited, the two patches can stack on top
of each other.
Signed-off-by: Mel Gorman <mgorman@suse.de>
---
mm/mremap.c | 4 ----
1 file changed, 4 deletions(-)
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -190,8 +190,6 @@ static void move_ptes(struct vm_area_str
drop_rmap_locks(vma);
}
-#define LATENCY_LIMIT (64 * PAGE_SIZE)
-
unsigned long move_page_tables(struct vm_area_struct *vma,
unsigned long old_addr, struct vm_area_struct *new_vma,
unsigned long new_addr, unsigned long len,
@@ -246,8 +244,6 @@ unsigned long move_page_tables(struct vm
next = (new_addr + PMD_SIZE) & PMD_MASK;
if (extent > next - new_addr)
extent = next - new_addr;
- if (extent > LATENCY_LIMIT)
- extent = LATENCY_LIMIT;
move_ptes(vma, old_pmd, old_addr, old_addr + extent, new_vma,
new_pmd, new_addr, need_rmap_locks, &need_flush);
}