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7014918: Improve core/minidump handling in Hotspot

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Added Minidump support on Windows, enabled large page core dumps when coredump_filter is present and writing out path/rlimit for core dumps.

Reviewed-by: poonam, dsamersoff, sla, coleenp
This commit is contained in:
Christian Tornqvist 2011-02-09 11:08:10 +01:00
parent 8ff932b950
commit 237866941a
8 changed files with 232 additions and 11 deletions
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42
hotspot/src/os/linux/vm/os_linux.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -131,6 +131,7 @@
#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
#define SEC_IN_NANOSECS 1000000000LL
#define LARGEPAGES_BIT (1 << 6)
////////////////////////////////////////////////////////////////////////////////
// global variables
julong os::Linux::_physical_memory = 0;
@ -2817,6 +2818,43 @@ bool os::unguard_memory(char* addr, size_t size) {
return linux_mprotect(addr, size, PROT_READ|PROT_WRITE);
}
/*
* Set the coredump_filter bits to include largepages in core dump (bit 6)
*
* From the coredump_filter documentation:
*
* - (bit 0) anonymous private memory
* - (bit 1) anonymous shared memory
* - (bit 2) file-backed private memory
* - (bit 3) file-backed shared memory
* - (bit 4) ELF header pages in file-backed private memory areas (it is
* effective only if the bit 2 is cleared)
* - (bit 5) hugetlb private memory
* - (bit 6) hugetlb shared memory
*/
static void set_coredump_filter(void) {
FILE *f;
long cdm;
if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) {
return;
}
if (fscanf(f, "%lx", &cdm) != 1) {
fclose(f);
return;
}
rewind(f);
if ((cdm & LARGEPAGES_BIT) == 0) {
cdm |= LARGEPAGES_BIT;
fprintf(f, "%#lx", cdm);
}
fclose(f);
}
// Large page support
static size_t _large_page_size = 0;
@ -2874,6 +2912,8 @@ bool os::large_page_init() {
_page_sizes[2] = 0;
}
set_coredump_filter();
// Large page support is available on 2.6 or newer kernel, some vendors
// (e.g. Redhat) have backported it to their 2.4 based distributions.
// We optimistically assume the support is available. If later it turns out