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authorJamie Liu <jamieliu@google.com>2018-12-17 11:37:38 -0800
committerShentubot <shentubot@google.com>2018-12-17 11:38:59 -0800
commit2421006426445a1827422c2dbdd6fc6a47087147 (patch)
tree49aa2bc113c208fc117aff8a036866a7260090e5 /pkg/abi
parent54694086dfb02a6f8453f043a44ffd10bb5a7070 (diff)
Implement mlock(), kind of.
Currently mlock() and friends do nothing whatsoever. However, mlocking is directly application-visible in a number of ways; for example, madvise(MADV_DONTNEED) and msync(MS_INVALIDATE) both fail on mlocked regions. We handle this inconsistently: MADV_DONTNEED is too important to not work, but MS_INVALIDATE is rejected. Change MM to track mlocked regions in a manner consistent with Linux. It still will not actually pin pages into host physical memory, but: - mlock() will now cause sentry memory management to precommit mlocked pages. - MADV_DONTNEED and MS_INVALIDATE will interact with mlocked pages as described above. PiperOrigin-RevId: 225861605 Change-Id: Iee187204979ac9a4d15d0e037c152c0902c8d0ee
Diffstat (limited to 'pkg/abi')
-rw-r--r--pkg/abi/linux/limits.go2
-rw-r--r--pkg/abi/linux/mm.go12
2 files changed, 13 insertions, 1 deletions
diff --git a/pkg/abi/linux/limits.go b/pkg/abi/linux/limits.go
index b2e51b9bd..e0aa5b31d 100644
--- a/pkg/abi/linux/limits.go
+++ b/pkg/abi/linux/limits.go
@@ -60,7 +60,7 @@ const (
DefaultNofileHardLimit = 4096
// DefaultMemlockLimit is called MLOCK_LIMIT in Linux.
- DefaultMemlockLimit = 64 * 1094
+ DefaultMemlockLimit = 64 * 1024
// DefaultMsgqueueLimit is called MQ_BYTES_MAX in Linux.
DefaultMsgqueueLimit = 819200
diff --git a/pkg/abi/linux/mm.go b/pkg/abi/linux/mm.go
index 3fcdf8235..eda8d9788 100644
--- a/pkg/abi/linux/mm.go
+++ b/pkg/abi/linux/mm.go
@@ -49,6 +49,18 @@ const (
MREMAP_FIXED = 1 << 1
)
+// Flags for mlock2(2).
+const (
+ MLOCK_ONFAULT = 0x01
+)
+
+// Flags for mlockall(2).
+const (
+ MCL_CURRENT = 1
+ MCL_FUTURE = 2
+ MCL_ONFAULT = 4
+)
+
// Advice for madvise(2).
const (
MADV_NORMAL = 0