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runtime: improve efence

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Mark free memory blocks as unused.
On amd64 it allows the process to eat all 128 GB of heap
without killing the machine.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/74070043
This commit is contained in:
Dmitriy Vyukov 2014-03-13 19:04:00 +04:00
parent cdc93d2416
commit c115cda22c
9 changed files with 10 additions and 13 deletions
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2
src/pkg/runtime/mem_darwin.c
View File

@ -44,7 +44,7 @@ runtime·SysFree(void *v, uintptr n, uint64 *stat)
void
runtime·SysFault(void *v, uintptr n)
{
runtime·mmap(v, n, PROT_NONE, 0, -1, 0);
runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1, 0);
}
void*

2
src/pkg/runtime/mem_dragonfly.c
View File

@ -48,7 +48,7 @@ runtime·SysFree(void *v, uintptr n, uint64 *stat)
void
runtime·SysFault(void *v, uintptr n)
{
runtime·mmap(v, n, PROT_NONE, 0, -1, 0);
runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1, 0);
}
void*

2
src/pkg/runtime/mem_freebsd.c
View File

@ -48,7 +48,7 @@ runtime·SysFree(void *v, uintptr n, uint64 *stat)
void
runtime·SysFault(void *v, uintptr n)
{
runtime·mmap(v, n, PROT_NONE, 0, -1, 0);
runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1, 0);
}
void*

2
src/pkg/runtime/mem_linux.c
View File

@ -95,7 +95,7 @@ runtime·SysFree(void *v, uintptr n, uint64 *stat)
void
runtime·SysFault(void *v, uintptr n)
{
runtime·mmap(v, n, PROT_NONE, 0, -1, 0);
runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1, 0);
}
void*

2
src/pkg/runtime/mem_nacl.c
View File

@ -56,7 +56,7 @@ runtime·SysFree(void *v, uintptr n, uint64 *stat)
void
runtime·SysFault(void *v, uintptr n)
{
runtime·mmap(v, n, PROT_NONE, 0, -1, 0);
runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1, 0);
}
void*

2
src/pkg/runtime/mem_netbsd.c
View File

@ -48,7 +48,7 @@ runtime·SysFree(void *v, uintptr n, uint64 *stat)
void
runtime·SysFault(void *v, uintptr n)
{
runtime·mmap(v, n, PROT_NONE, 0, -1, 0);
runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1, 0);
}
void*

2
src/pkg/runtime/mem_openbsd.c
View File

@ -48,7 +48,7 @@ runtime·SysFree(void *v, uintptr n, uint64 *stat)
void
runtime·SysFault(void *v, uintptr n)
{
runtime·mmap(v, n, PROT_NONE, 0, -1, 0);
runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1, 0);
}
void*

2
src/pkg/runtime/mem_solaris.c
View File

@ -49,7 +49,7 @@ runtime·SysFree(void *v, uintptr n, uint64 *stat)
void
runtime·SysFault(void *v, uintptr n)
{
runtime·mmap(v, n, PROT_NONE, 0, -1, 0);
runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, -1, 0);
}
void*

7
src/pkg/runtime/mem_windows.c
View File

@ -66,11 +66,8 @@ runtime·SysFree(void *v, uintptr n, uint64 *stat)
void
runtime·SysFault(void *v, uintptr n)
{
uintptr r, old;
r = (uintptr)runtime·stdcall(runtime·VirtualProtect, 4, v, n, (uintptr)PAGE_NOACCESS, &old);
if(r == 0)
runtime·throw("runtime: failed to protect pages");
// SysUnused makes the memory inaccessible and prevents its reuse
runtime·SysUnused(v, n);
}
void*