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8194086: Remove deprecated experimental flag UseCGroupMemoryLimitForHeap

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Remove the option and the code that checks for it.

Reviewed-by: dholmes, lfoltan
This commit is contained in:
Harold Seigel 2018-01-22 14:04:07 -05:00
parent 1a25bbdf0f
commit e52d643ff5
2 changed files with 0 additions and 32 deletions
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27
src/hotspot/share/runtime/arguments.cpp
View file

@ -509,7 +509,6 @@ static SpecialFlag const special_jvm_flags[] = {
{ "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
{ "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
{ "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
{ "UseCGroupMemoryLimitForHeap", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::jdk(11) },
{ "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
{ "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
@ -1856,32 +1855,6 @@ void Arguments::set_heap_size() {
FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
: (julong)MaxRAM;
// Experimental support for CGroup memory limits
if (UseCGroupMemoryLimitForHeap) {
// This is a rough indicator that a CGroup limit may be in force
// for this process
const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
FILE *fp = fopen(lim_file, "r");
if (fp != NULL) {
julong cgroup_max = 0;
int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
if (ret == 1 && cgroup_max > 0) {
// If unlimited, cgroup_max will be a very large, but unspecified
// value, so use initial phys_mem as a limit
log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
JULONG_FORMAT "MB) and initial phys_mem ("
JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
phys_mem = MIN2(cgroup_max, phys_mem);
} else {
warning("Unable to read/parse cgroup memory limit from %s: %s",
lim_file, errno != 0 ? strerror(errno) : "unknown error");
}
fclose(fp);
} else {
warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
}
}
// Convert deprecated flags
if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
!FLAG_IS_DEFAULT(MaxRAMFraction))

5
src/hotspot/share/runtime/globals.hpp
View file

@ -2042,11 +2042,6 @@ public:
"MaxRAM * MaxRAMPercentage / 100") \
range(0, max_uintx) \
\
experimental(bool, UseCGroupMemoryLimitForHeap, false, \
"Use CGroup memory limit as physical memory limit for heap " \
"sizing" \
"Deprecated, replaced by container support") \
\
product(uintx, MaxRAMFraction, 4, \
"Maximum fraction (1/n) of real memory used for maximum heap " \
"size. " \