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8007074: SIGSEGV at ParMarkBitMap::verify_clear()

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Replace the broken large pages implementation on Linux. New flag: -XX:+UseTransparentHugePages - Linux specific flag to turn on transparent huge page hinting with madvise(..., MAP_HUGETLB). Changed behavior: -XX:+UseLargePages - tries to use -XX:+UseTransparentHugePages before trying other large pages implementations (on Linux). Changed behavior: -XX:+UseHugeTLBFS - Use upfront allocation of Large Pages instead of using the broken implementation to dynamically committing large pages. Changed behavior: -XX:LargePageSizeInBytes - Turned off the ability to use this flag on Linux and provides warning to user if set to a value different than the OS chosen large page size. Changed behavior: Setting no large page size - Now defaults to use -XX:UseTransparentHugePages if the OS supports it. Previously, -XX:+UseHugeTLBFS was chosen if the OS was configured to use large pages.

Reviewed-by: tschatzl, dcubed, brutisso
This commit is contained in:
Stefan Karlsson 2013-08-16 13:22:32 +02:00
parent 6a548048a3
commit 7ade7987a0
20 changed files with 796 additions and 159 deletions
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14
hotspot/src/os/linux/vm/os_linux.hpp
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@ -32,6 +32,7 @@ typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
class Linux {
friend class os;
friend class TestReserveMemorySpecial;
// For signal-chaining
#define MAXSIGNUM 32
@ -92,8 +93,21 @@ class Linux {
static void rebuild_cpu_to_node_map();
static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
static size_t find_large_page_size();
static size_t setup_large_page_size();
static bool setup_large_page_type(size_t page_size);
static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size);
static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec);
static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec);
static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec);
static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec);
static bool release_memory_special_shm(char* base, size_t bytes);
static bool release_memory_special_huge_tlbfs(char* base, size_t bytes);
static void print_full_memory_info(outputStream* st);
static void print_distro_info(outputStream* st);
static void print_libversion_info(outputStream* st);