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8247289: Obsolete unused UseBsdPosixThreadCPUClocks

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8247292: Obsolete unused UseOprofile flag on BSD

Co-authored-by: Christoph Dreis <christoph.dreis@freenet.de>
Reviewed-by: hseigel, dcubed
This commit is contained in:
David Holmes 2020-06-15 18:35:46 -04:00
parent 23e2f27996
commit 0be5b7d66e
3 changed files with 5 additions and 45 deletions
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10
src/hotspot/os/bsd/globals_bsd.hpp
View file

@ -36,15 +36,7 @@
diagnostic_pd, \
notproduct, \
range, \
constraint) \
\
product(bool, UseOprofile, false, \
"enable support for Oprofile profiler") \
\
/* NB: The default value of UseBsdPosixThreadCPUClocks may be */ \
/* overridden in Arguments::parse_each_vm_init_arg. */ \
product(bool, UseBsdPosixThreadCPUClocks, true, \
"enable fast Bsd Posix clocks where available") \
constraint)
//
// Defines Bsd-specific default values. The flags are available on all

36
src/hotspot/os/bsd/os_bsd.cpp
View file

@ -1879,42 +1879,6 @@ int os::vm_allocation_granularity() {
return os::Bsd::page_size();
}
// Rationale behind this function:
// current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
// mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
// samples for JITted code. Here we create private executable mapping over the code cache
// and then we can use standard (well, almost, as mapping can change) way to provide
// info for the reporting script by storing timestamp and location of symbol
void bsd_wrap_code(char* base, size_t size) {
static volatile jint cnt = 0;
if (!UseOprofile) {
return;
}
char buf[PATH_MAX + 1];
int num = Atomic::add(&cnt, 1);
snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
os::get_temp_directory(), os::current_process_id(), num);
unlink(buf);
int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
if (fd != -1) {
off_t rv = ::lseek(fd, size-2, SEEK_SET);
if (rv != (off_t)-1) {
if (::write(fd, "", 1) == 1) {
mmap(base, size,
PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
}
}
::close(fd);
unlink(buf);
}
}
static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
int err) {
warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT

4
src/hotspot/share/runtime/arguments.cpp
View file

@ -548,6 +548,10 @@ static SpecialFlag const special_jvm_flags[] = {
{ "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
{ "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
{ "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
#ifdef BSD
{ "UseBsdPosixThreadCPUClocks", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
{ "UseOprofile", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) },
#endif
#ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
// These entries will generate build errors. Their purpose is to test the macros.