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lua: introduce soft memory limits that trigger a gc run but do not result in an oom error

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SVN-Revision: 17016
This commit is contained in:
Jo-Philipp Wich
2009-07-26 15:06:43 +00:00
parent 3fee02f1a9
commit b18a60e1ac
2 changed files with 23 additions and 11 deletions
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2
package/lua/Makefile
View File

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=lua
PKG_VERSION:=5.1.4
PKG_RELEASE:=4
PKG_RELEASE:=5
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
PKG_SOURCE_URL:=http://www.lua.org/ftp/ \

32
package/lua/patches/040-memory-limits.patch
View File

@@ -147,7 +147,7 @@
last -= n-1;
--- a/src/lua.c
+++ b/src/lua.c
@@ -19,6 +19,82 @@
@@ -19,6 +19,94 @@
#include "llimits.h"
@@ -156,6 +156,7 @@
+ lua_State *L;
+ size_t memused;
+ size_t peak_memused;
+ size_t gc_memused;
+ size_t max_memused;
+ int collecting;
+} script_info_t;
@@ -172,7 +173,8 @@
+ return NULL;
+ }
+ info->memused += nsize;
+ if(info->max_memused > 0 && nsize > osize && info->memused >= info->max_memused) {
+ if(info->max_memused > 0 && nsize > osize &&
+ (info->memused >= info->max_memused || info->memused >= info->gc_memused)) {
+#ifdef LOW_MEM_DEBUG
+ printf("LOW MEM: 1 osize=%zd, nsize=%zd, used=%zu, peak=%zu, need=%zd\n", osize, nsize,
+ info->memused, info->peak_memused, (info->memused - info->max_memused));
@@ -207,15 +209,24 @@
+
+static int set_memory_limit(lua_State *L)
+{
+ int limit = luaL_checknumber(L, 1);
+ int hardlimit = luaL_checknumber(L, 1);
+ int softlimit = luaL_optnumber(L, 2, 0);
+
+ script_info_t *info;
+ lua_getallocf(L, (void *)(&info));
+
+ if( limit >= 0 )
+ info->max_memused = limit;
+ if( hardlimit >= 0 )
+ {
+ if( softlimit <= 0 )
+ softlimit = (int)((float)hardlimit * 0.75);
+
+ lua_pushnumber(L, limit);
+ return 1;
+ info->max_memused = hardlimit;
+ info->gc_memused = softlimit;
+ }
+
+ lua_pushnumber(L, hardlimit);
+ lua_pushnumber(L, softlimit);
+ return 2;
+}
+
+static int get_memory_limit(lua_State *L)
@@ -223,14 +234,15 @@
+ script_info_t *info;
+ lua_getallocf(L, (void *)(&info));
+ lua_pushnumber(L, info->max_memused);
+ return 1;
+ lua_pushnumber(L, info->gc_memused);
+ return 2;
+}
+
+
static lua_State *globalL = NULL;
static const char *progname = LUA_PROGNAME;
@@ -377,11 +453,28 @@
@@ -377,11 +465,28 @@
int main (int argc, char **argv) {
int status;
struct Smain s;
@@ -260,7 +272,7 @@
/* Checking 'sizeof(lua_Integer)' cannot be made in preprocessor on all compilers.
*/
#ifdef LNUM_INT16
@@ -396,6 +489,14 @@
@@ -396,6 +501,14 @@
status = lua_cpcall(L, &pmain, &s);
report(L, status);
lua_close(L);