1.1 --- a/src/os/linux/vm/os_linux.cpp Tue Feb 08 22:27:57 2011 -0800
1.2 +++ b/src/os/linux/vm/os_linux.cpp Wed Feb 09 11:08:10 2011 +0100
1.3 @@ -1,5 +1,5 @@
1.4 /*
1.5 - * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
1.7 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.8 *
1.9 * This code is free software; you can redistribute it and/or modify it
1.10 @@ -131,6 +131,7 @@
1.11 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
1.12 #define SEC_IN_NANOSECS 1000000000LL
1.13
1.14 +#define LARGEPAGES_BIT (1 << 6)
1.15 ////////////////////////////////////////////////////////////////////////////////
1.16 // global variables
1.17 julong os::Linux::_physical_memory = 0;
1.18 @@ -2817,6 +2818,43 @@
1.19 return linux_mprotect(addr, size, PROT_READ|PROT_WRITE);
1.20 }
1.21
1.22 +/*
1.23 +* Set the coredump_filter bits to include largepages in core dump (bit 6)
1.24 +*
1.25 +* From the coredump_filter documentation:
1.26 +*
1.27 +* - (bit 0) anonymous private memory
1.28 +* - (bit 1) anonymous shared memory
1.29 +* - (bit 2) file-backed private memory
1.30 +* - (bit 3) file-backed shared memory
1.31 +* - (bit 4) ELF header pages in file-backed private memory areas (it is
1.32 +* effective only if the bit 2 is cleared)
1.33 +* - (bit 5) hugetlb private memory
1.34 +* - (bit 6) hugetlb shared memory
1.35 +*/
1.36 +static void set_coredump_filter(void) {
1.37 + FILE *f;
1.38 + long cdm;
1.39 +
1.40 + if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) {
1.41 + return;
1.42 + }
1.43 +
1.44 + if (fscanf(f, "%lx", &cdm) != 1) {
1.45 + fclose(f);
1.46 + return;
1.47 + }
1.48 +
1.49 + rewind(f);
1.50 +
1.51 + if ((cdm & LARGEPAGES_BIT) == 0) {
1.52 + cdm |= LARGEPAGES_BIT;
1.53 + fprintf(f, "%#lx", cdm);
1.54 + }
1.55 +
1.56 + fclose(f);
1.57 +}
1.58 +
1.59 // Large page support
1.60
1.61 static size_t _large_page_size = 0;
1.62 @@ -2874,6 +2912,8 @@
1.63 _page_sizes[2] = 0;
1.64 }
1.65
1.66 + set_coredump_filter();
1.67 +
1.68 // Large page support is available on 2.6 or newer kernel, some vendors
1.69 // (e.g. Redhat) have backported it to their 2.4 based distributions.
1.70 // We optimistically assume the support is available. If later it turns out
