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6791178: Specialize for zero as the compressed oop vm heap base

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Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.

Reviewed-by: never, twisti, jcoomes, coleenp
This commit is contained in:
Vladimir Kozlov 2009-03-12 10:37:46 -07:00
parent 66cecec230
commit 69f9ddee90
45 changed files with 1072 additions and 220 deletions
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63
hotspot/src/os/solaris/dtrace/libjvm_db.c
View file

@ -146,13 +146,17 @@ struct jvm_agent {
uint64_t BufferBlob_vtbl;
uint64_t RuntimeStub_vtbl;
uint64_t Use_Compressed_Oops_address;
uint64_t Universe_methodKlassObj_address;
uint64_t Universe_narrow_oop_base_address;
uint64_t Universe_narrow_oop_shift_address;
uint64_t CodeCache_heap_address;
uint64_t Universe_heap_base_address;
/* Volatiles */
uint8_t Use_Compressed_Oops;
uint64_t Universe_methodKlassObj;
uint64_t Universe_heap_base;
uint64_t Universe_narrow_oop_base;
uint32_t Universe_narrow_oop_shift;
uint64_t CodeCache_low;
uint64_t CodeCache_high;
uint64_t CodeCache_segmap_low;
@ -279,8 +283,11 @@ static int parse_vmstructs(jvm_agent_t* J) {
if (strcmp("_methodKlassObj", vmp->fieldName) == 0) {
J->Universe_methodKlassObj_address = vmp->address;
}
if (strcmp("_heap_base", vmp->fieldName) == 0) {
J->Universe_heap_base_address = vmp->address;
if (strcmp("_narrow_oop._base", vmp->fieldName) == 0) {
J->Universe_narrow_oop_base_address = vmp->address;
}
if (strcmp("_narrow_oop._shift", vmp->fieldName) == 0) {
J->Universe_narrow_oop_shift_address = vmp->address;
}
}
CHECK_FAIL(err);
@ -298,14 +305,39 @@ static int parse_vmstructs(jvm_agent_t* J) {
return -1;
}
static int find_symbol(jvm_agent_t* J, const char *name, uint64_t* valuep) {
psaddr_t sym_addr;
int err;
err = ps_pglobal_lookup(J->P, LIBJVM_SO, name, &sym_addr);
if (err != PS_OK) goto fail;
*valuep = sym_addr;
return PS_OK;
fail:
return err;
}
static int read_volatiles(jvm_agent_t* J) {
uint64_t ptr;
int err;
err = find_symbol(J, "UseCompressedOops", &J->Use_Compressed_Oops_address);
if (err == PS_OK) {
err = ps_pread(J->P, J->Use_Compressed_Oops_address, &J->Use_Compressed_Oops, sizeof(uint8_t));
CHECK_FAIL(err);
} else {
J->Use_Compressed_Oops = 0;
}
err = read_pointer(J, J->Universe_methodKlassObj_address, &J->Universe_methodKlassObj);
CHECK_FAIL(err);
err = read_pointer(J, J->Universe_heap_base_address, &J->Universe_heap_base);
err = read_pointer(J, J->Universe_narrow_oop_base_address, &J->Universe_narrow_oop_base);
CHECK_FAIL(err);
err = ps_pread(J->P, J->Universe_narrow_oop_shift_address, &J->Universe_narrow_oop_shift, sizeof(uint32_t));
CHECK_FAIL(err);
err = read_pointer(J, J->CodeCache_heap_address + OFFSET_CodeHeap_memory +
OFFSET_VirtualSpace_low, &J->CodeCache_low);
CHECK_FAIL(err);
@ -374,19 +406,6 @@ static int find_start(jvm_agent_t* J, uint64_t ptr, uint64_t *startp) {
return -1;
}
static int find_symbol(jvm_agent_t* J, const char *name, uint64_t* valuep) {
psaddr_t sym_addr;
int err;
err = ps_pglobal_lookup(J->P, LIBJVM_SO, name, &sym_addr);
if (err != PS_OK) goto fail;
*valuep = sym_addr;
return PS_OK;
fail:
return err;
}
static int find_jlong_constant(jvm_agent_t* J, const char *name, uint64_t* valuep) {
psaddr_t sym_addr;
int err = ps_pglobal_lookup(J->P, LIBJVM_SO, name, &sym_addr);
@ -458,14 +477,14 @@ void Jagent_destroy(jvm_agent_t *J) {
static int is_methodOop(jvm_agent_t* J, uint64_t methodOopPtr) {
uint64_t klass;
int err;
// If heap_base is nonnull, this was a compressed oop.
if (J->Universe_heap_base != NULL) {
// If UseCompressedOops, this was a compressed oop.
if (J->Use_Compressed_Oops != 0) {
uint32_t cklass;
err = read_compressed_pointer(J, methodOopPtr + OFFSET_oopDesc_metadata,
&cklass);
// decode heap oop, same as oop.inline.hpp
klass = (uint64_t)((uintptr_t)J->Universe_heap_base +
((uintptr_t)cklass << 3));
klass = (uint64_t)((uintptr_t)J->Universe_narrow_oop_base +
((uintptr_t)cklass << J->Universe_narrow_oop_shift));
} else {
err = read_pointer(J, methodOopPtr + OFFSET_oopDesc_metadata, &klass);
}