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63 lines
2 KiB
Diff
63 lines
2 KiB
Diff
From 6576bf83cdf4eac05eb88a24aa934a736c91e3da Mon Sep 17 00:00:00 2001
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From: Ben Gamari <bgamari.foss@gmail.com>
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Date: Thu, 1 Dec 2016 12:55:23 -0500
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Subject: [PATCH] rts: Ensure we always give MADV_DONTNEED a chance in
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osDecommitMemory
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As described in #12865, newer Linux kernels support both MADV_FREE and
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MADV_DONTNEED. Previously a runtime would fail to try MADV_DONTNEED if
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MADV_FREE failed (e.g. since the kernel which the image is running on
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doesn't support the latter). Now we try MADV_DONTNEED if MADV_FREE
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failed to ensure that binaries compiled on a kernel supporting MADV_FREE
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don't fail on decommit.
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Test Plan: Validate
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Reviewers: austin, erikd, simonmar
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Reviewed By: simonmar
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Subscribers: thomie
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Differential Revision: https://phabricator.haskell.org/D2780
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GHC Trac Issues: #12865
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---
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rts/posix/OSMem.c | 19 ++++++++++++++++---
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1 file changed, 16 insertions(+), 3 deletions(-)
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diff --git a/rts/posix/OSMem.c b/rts/posix/OSMem.c
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index 5291745..beffeda 100644
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--- a/rts/posix/OSMem.c
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+++ b/rts/posix/OSMem.c
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@@ -541,11 +541,24 @@ void osDecommitMemory(void *at, W_ size)
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#ifdef MADV_FREE
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// Try MADV_FREE first, FreeBSD has both and MADV_DONTNEED
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- // just swaps memory out
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+ // just swaps memory out. Linux >= 4.5 has both DONTNEED and FREE; either
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+ // will work as they both allow the system to free anonymous pages.
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+ // It is important that we try both methods as the kernel which we were
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+ // built on may differ from the kernel we are now running on.
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r = madvise(at, size, MADV_FREE);
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-#else
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- r = madvise(at, size, MADV_DONTNEED);
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+ if(r < 0) {
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+ if (errno == EINVAL) {
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+ // Perhaps the system doesn't support MADV_FREE; fall-through and
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+ // try MADV_DONTNEED.
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+ } else {
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+ sysErrorBelch("unable to decommit memory");
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+ }
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+ } else {
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+ return;
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+ }
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#endif
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+
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+ r = madvise(at, size, MADV_DONTNEED);
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if(r < 0)
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sysErrorBelch("unable to decommit memory");
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}
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--
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1.9.1
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