mirror of
https://github.com/archlinuxarm/PKGBUILDs.git
synced 2024-09-19 22:08:32 +00:00
64 lines
2 KiB
Diff
64 lines
2 KiB
Diff
From 6576bf83cdf4eac05eb88a24aa934a736c91e3da Mon Sep 17 00:00:00 2001
|
|
From: Ben Gamari <bgamari.foss@gmail.com>
|
|
Date: Thu, 1 Dec 2016 12:55:23 -0500
|
|
Subject: [PATCH] rts: Ensure we always give MADV_DONTNEED a chance in
|
|
osDecommitMemory
|
|
|
|
As described in #12865, newer Linux kernels support both MADV_FREE and
|
|
MADV_DONTNEED. Previously a runtime would fail to try MADV_DONTNEED if
|
|
MADV_FREE failed (e.g. since the kernel which the image is running on
|
|
doesn't support the latter). Now we try MADV_DONTNEED if MADV_FREE
|
|
failed to ensure that binaries compiled on a kernel supporting MADV_FREE
|
|
don't fail on decommit.
|
|
|
|
Test Plan: Validate
|
|
|
|
Reviewers: austin, erikd, simonmar
|
|
|
|
Reviewed By: simonmar
|
|
|
|
Subscribers: thomie
|
|
|
|
Differential Revision: https://phabricator.haskell.org/D2780
|
|
|
|
GHC Trac Issues: #12865
|
|
---
|
|
rts/posix/OSMem.c | 19 ++++++++++++++++---
|
|
1 file changed, 16 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/rts/posix/OSMem.c b/rts/posix/OSMem.c
|
|
index 5291745..beffeda 100644
|
|
--- a/rts/posix/OSMem.c
|
|
+++ b/rts/posix/OSMem.c
|
|
@@ -541,11 +541,24 @@ void osDecommitMemory(void *at, W_ size)
|
|
|
|
#ifdef MADV_FREE
|
|
// Try MADV_FREE first, FreeBSD has both and MADV_DONTNEED
|
|
- // just swaps memory out
|
|
+ // just swaps memory out. Linux >= 4.5 has both DONTNEED and FREE; either
|
|
+ // will work as they both allow the system to free anonymous pages.
|
|
+ // It is important that we try both methods as the kernel which we were
|
|
+ // built on may differ from the kernel we are now running on.
|
|
r = madvise(at, size, MADV_FREE);
|
|
-#else
|
|
- r = madvise(at, size, MADV_DONTNEED);
|
|
+ if(r < 0) {
|
|
+ if (errno == EINVAL) {
|
|
+ // Perhaps the system doesn't support MADV_FREE; fall-through and
|
|
+ // try MADV_DONTNEED.
|
|
+ } else {
|
|
+ sysErrorBelch("unable to decommit memory");
|
|
+ }
|
|
+ } else {
|
|
+ return;
|
|
+ }
|
|
#endif
|
|
+
|
|
+ r = madvise(at, size, MADV_DONTNEED);
|
|
if(r < 0)
|
|
sysErrorBelch("unable to decommit memory");
|
|
}
|
|
--
|
|
1.9.1
|
|
|