From 0c16b0931feb67641b91d973dbf8f5756384c19a Mon Sep 17 00:00:00 2001 From: Paul Guyot Date: Sat, 29 Jan 2011 11:00:27 +0100 Subject: Remove hipe constants pool Hipe constants used to be allocated within a single, fixed-size pool for interaction with the garbage collector. However, the garbage collector no longer depends on constants being allocated within a single pool, and the fixed size of the pool both meant unnecessary allocations on most deployments and crashes on deployments requiring more constants. The code was simplified to directly invoke erts_alloc. Debugging and undocumented function hipe_bifs:show_literals/0 was removed (it returned true and output text to the console), and debugging and undocumented function hipe_bifs:constants_size/0 was rewritten with a global to count the size of allocated constants. --- erts/emulator/hipe/hipe_bif0.c | 50 ++++++---------------------------------- erts/emulator/hipe/hipe_bif0.h | 4 ---- erts/emulator/hipe/hipe_bif2.c | 13 ----------- erts/emulator/hipe/hipe_bif2.tab | 1 - erts/emulator/hipe/hipe_gc.c | 1 - 5 files changed, 7 insertions(+), 62 deletions(-) (limited to 'erts/emulator/hipe') diff --git a/erts/emulator/hipe/hipe_bif0.c b/erts/emulator/hipe/hipe_bif0.c index 2a877d8ace..4205b05831 100644 --- a/erts/emulator/hipe/hipe_bif0.c +++ b/erts/emulator/hipe/hipe_bif0.c @@ -450,52 +450,13 @@ BIF_RETTYPE hipe_bifs_alloc_data_2(BIF_ALIST_2) } /* - * Memory area for constant Erlang terms. - * - * These constants must not be forwarded by the gc. - * Therefore, the gc needs to be able to distinguish between - * collectible objects and constants. Unfortunately, an Erlang - * process' collectible objects are scattered around in two - * heaps and a list of message buffers, so testing "is X a - * collectible object?" can be expensive. - * - * Instead, constants are placed in a single contiguous area, - * which allows for an inexpensive "is X a constant?" test. - * - * XXX: Allow this area to be grown. + * Statistics on hipe constants: size of HiPE constants, in words. */ - -/* not static, needed by garbage collector */ -Eterm *hipe_constants_start = NULL; -Eterm *hipe_constants_next = NULL; -static unsigned constants_avail_words = 0; -#define CONSTANTS_BYTES (1536*1024*sizeof(Eterm)) /* 1.5 M words */ - -static Eterm *constants_alloc(unsigned nwords) -{ - Eterm *next; - - /* initialise at the first call */ - if ((next = hipe_constants_next) == NULL) { - next = (Eterm*)erts_alloc(ERTS_ALC_T_HIPE, CONSTANTS_BYTES); - hipe_constants_start = next; - hipe_constants_next = next; - constants_avail_words = CONSTANTS_BYTES / sizeof(Eterm); - } - if (nwords > constants_avail_words) { - fprintf(stderr, "Native code constants pool depleted!\r\n"); - /* Must terminate immediately. erl_exit() seems to - continue running some code which then SIGSEGVs. */ - exit(1); - } - constants_avail_words -= nwords; - hipe_constants_next = next + nwords; - return next; -} +unsigned int hipe_constants_size = 0; BIF_RETTYPE hipe_bifs_constants_size_0(BIF_ALIST_0) { - BIF_RET(make_small(hipe_constants_next - hipe_constants_start)); + BIF_RET(make_small(hipe_constants_size)); } /* @@ -526,14 +487,17 @@ static void *const_term_alloc(void *tmpl) { Eterm obj; Uint size; + Uint alloc_size; Eterm *hp; struct const_term *p; obj = (Eterm)tmpl; ASSERT(is_not_immed(obj)); size = size_object(obj); + alloc_size = size + (offsetof(struct const_term, mem)/sizeof(Eterm)); + hipe_constants_size += alloc_size; - p = (struct const_term*)constants_alloc(size + (offsetof(struct const_term, mem)/sizeof(Eterm))); + p = (struct const_term*)erts_alloc(ERTS_ALC_T_HIPE, alloc_size * sizeof(Eterm)); /* I have absolutely no idea if having a private 'off_heap' works or not. _Some_ off_heap object is required for diff --git a/erts/emulator/hipe/hipe_bif0.h b/erts/emulator/hipe/hipe_bif0.h index ed27d5616a..a283ffe803 100644 --- a/erts/emulator/hipe/hipe_bif0.h +++ b/erts/emulator/hipe/hipe_bif0.h @@ -26,10 +26,6 @@ extern Uint *hipe_bifs_find_pc_from_mfa(Eterm mfa); -/* shared with ggc.c -- NOT an official API */ -extern Eterm *hipe_constants_start; -extern Eterm *hipe_constants_next; - extern void hipe_mfa_info_table_init(void); extern void *hipe_get_remote_na(Eterm m, Eterm f, unsigned int a); extern Eterm hipe_find_na_or_make_stub(Process*, Eterm, Eterm, Eterm); diff --git a/erts/emulator/hipe/hipe_bif2.c b/erts/emulator/hipe/hipe_bif2.c index f992b758be..e5a236ce69 100644 --- a/erts/emulator/hipe/hipe_bif2.c +++ b/erts/emulator/hipe/hipe_bif2.c @@ -33,7 +33,6 @@ #include "big.h" #include "hipe_debug.h" #include "hipe_mode_switch.h" -#include "hipe_bif0.h" /* hipe_constants_{start,next} */ #include "hipe_arch.h" #include "hipe_stack.h" @@ -124,18 +123,6 @@ BIF_RETTYPE hipe_bifs_show_term_1(BIF_ALIST_1) BIF_RET(am_true); } -BIF_RETTYPE hipe_bifs_show_literals_0(BIF_ALIST_0) -{ - Eterm *p; - - p = hipe_constants_start; - for (; p < hipe_constants_next; ++p) - printf("0x%0*lx: 0x%0*lx\r\n", - 2*(int)sizeof(long), (unsigned long)p, - 2*(int)sizeof(long), *p); - BIF_RET(am_true); -} - BIF_RETTYPE hipe_bifs_in_native_0(BIF_ALIST_0) { BIF_RET(am_false); diff --git a/erts/emulator/hipe/hipe_bif2.tab b/erts/emulator/hipe/hipe_bif2.tab index d8d627e370..9578b69e27 100644 --- a/erts/emulator/hipe/hipe_bif2.tab +++ b/erts/emulator/hipe/hipe_bif2.tab @@ -26,7 +26,6 @@ bif hipe_bifs:show_nstack/1 bif hipe_bifs:nstack_used_size/0 bif hipe_bifs:show_pcb/1 bif hipe_bifs:show_term/1 -bif hipe_bifs:show_literals/0 bif hipe_bifs:in_native/0 bif hipe_bifs:modeswitch_debug_on/0 bif hipe_bifs:modeswitch_debug_off/0 diff --git a/erts/emulator/hipe/hipe_gc.c b/erts/emulator/hipe/hipe_gc.c index 6c9e1d9ba7..6dd296d027 100644 --- a/erts/emulator/hipe/hipe_gc.c +++ b/erts/emulator/hipe/hipe_gc.c @@ -28,7 +28,6 @@ #include "hipe_stack.h" #include "hipe_gc.h" -#include "hipe_bif0.h" /* for hipe_constants_{start,next} */ Eterm *fullsweep_nstack(Process *p, Eterm *n_htop) { -- cgit v1.2.3