archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-19 10:34:38 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8281023: NMT integration into pp debug command does not work

Browse source 
Reviewed-by: zgu, iklam
This commit is contained in:
Thomas Stuefe 2022-02-03 14:12:29 +00:00
parent 63a00a0df2
commit 010965c86a
5 changed files with 72 additions and 43 deletions
Download patch file Download diff file Expand all files Collapse all files

30
src/hotspot/share/services/mallocTracker.cpp
View file

@ -24,6 +24,7 @@
#include "precompiled.hpp"
#include "runtime/os.hpp"
#include "runtime/safefetch.inline.hpp"
#include "services/mallocSiteTable.hpp"
#include "services/mallocTracker.hpp"
#include "services/mallocTracker.inline.hpp"
@ -289,3 +290,32 @@ void* MallocTracker::record_free(void* memblock) {
header->release();
return (void*)header;
}
// Given a pointer, if it seems to point to the start of a valid malloced block,
// print the block. Note that since there is very low risk of memory looking
// accidentally like a valid malloc block header (canaries and all) this is not
// totally failproof. Only use this during debugging or when you can afford
// signals popping up, e.g. when writing an hs_err file.
bool MallocTracker::print_pointer_information(const void* p, outputStream* st) {
assert(MemTracker::enabled(), "NMT must be enabled");
if (CanUseSafeFetch32() && os::is_readable_pointer(p)) {
const NMT_TrackingLevel tracking_level = MemTracker::tracking_level();
const MallocHeader* mhdr = (const MallocHeader*)MallocTracker::get_base(const_cast<void*>(p), tracking_level);
char msg[256];
address p_corrupted;
if (os::is_readable_pointer(mhdr) &&
mhdr->check_block_integrity(msg, sizeof(msg), &p_corrupted)) {
st->print_cr(PTR_FORMAT " malloc'd " SIZE_FORMAT " bytes by %s",
p2i(p), mhdr->size(), NMTUtil::flag_to_name(mhdr->flags()));
if (tracking_level == NMT_detail) {
NativeCallStack ncs;
if (mhdr->get_stack(ncs)) {
ncs.print_on(st);
st->cr();
}
}
return true;
}
}
return false;
}