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authorRickard Green <[email protected]>2015-11-11 10:20:18 +0100
committerRickard Green <[email protected]>2015-11-12 15:25:48 +0100
commit3e490ee1b43140ffcd8cb3fc3ccfe4339c08584e (patch)
tree544e8211359459ef2eab2389f3ceecf43d560cd6 /erts/emulator/beam
parent9c6f45b901ee701553afe34c0b33b7d931d73fd9 (diff)
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Improve yield strategy for list_to_binary()/binary_to_list()
Avoid yield in the BIF when input is small. This either yielding before beginning to work in the BIF, or by allowing some more reductions before yielding.
Diffstat (limited to 'erts/emulator/beam')
-rw-r--r--erts/emulator/beam/binary.c81
1 files changed, 74 insertions, 7 deletions
diff --git a/erts/emulator/beam/binary.c b/erts/emulator/beam/binary.c
index e670fbf31c..d3e481c7f9 100644
--- a/erts/emulator/beam/binary.c
+++ b/erts/emulator/beam/binary.c
@@ -34,6 +34,9 @@
#include "erl_binary.h"
#include "erl_bits.h"
+#define L2B_B2L_MIN_EXEC_REDS (CONTEXT_REDS/4)
+#define L2B_B2L_RESCHED_REDS (CONTEXT_REDS/40)
+
static Export binary_to_list_continue_export;
static Export list_to_binary_continue_export;
@@ -415,10 +418,10 @@ binary_to_list_chunk(Process *c_p,
}
static ERTS_INLINE BIF_RETTYPE
-binary_to_list(Process *c_p, Eterm *hp, Eterm tail, byte *bytes, Uint size, Uint bitoffs)
+binary_to_list(Process *c_p, Eterm *hp, Eterm tail, byte *bytes,
+ Uint size, Uint bitoffs, int reds_left, int one_chunk)
{
- int reds_left = ERTS_BIF_REDS_LEFT(c_p);
- if (size < reds_left*ERTS_B2L_BYTES_PER_REDUCTION) {
+ if (one_chunk) {
Eterm res;
BIF_RETTYPE ret;
int bump_reds = (size - 1)/ERTS_B2L_BYTES_PER_REDUCTION + 1;
@@ -472,11 +475,29 @@ BIF_RETTYPE binary_to_list_1(BIF_ALIST_1)
Uint size;
Uint bitsize;
Uint bitoffs;
+ int reds_left;
+ int one_chunk;
if (is_not_binary(BIF_ARG_1)) {
goto error;
}
+
size = binary_size(BIF_ARG_1);
+ reds_left = ERTS_BIF_REDS_LEFT(BIF_P);
+ one_chunk = size < reds_left*ERTS_B2L_BYTES_PER_REDUCTION;
+ if (!one_chunk) {
+ if (size < L2B_B2L_MIN_EXEC_REDS*ERTS_B2L_BYTES_PER_REDUCTION) {
+ if (reds_left <= L2B_B2L_RESCHED_REDS) {
+ /* Yield and do it with full context reds... */
+ ERTS_BIF_YIELD1(bif_export[BIF_binary_to_list_1],
+ BIF_P, BIF_ARG_1);
+ }
+ /* Allow a bit more reductions... */
+ one_chunk = 1;
+ reds_left = L2B_B2L_MIN_EXEC_REDS;
+ }
+ }
+
ERTS_GET_REAL_BIN(BIF_ARG_1, real_bin, offset, bitoffs, bitsize);
if (bitsize != 0) {
goto error;
@@ -486,7 +507,8 @@ BIF_RETTYPE binary_to_list_1(BIF_ALIST_1)
} else {
Eterm* hp = HAlloc(BIF_P, 2 * size);
byte* bytes = binary_bytes(real_bin)+offset;
- return binary_to_list(BIF_P, hp, NIL, bytes, size, bitoffs);
+ return binary_to_list(BIF_P, hp, NIL, bytes, size,
+ bitoffs, reds_left, one_chunk);
}
error:
@@ -505,6 +527,8 @@ BIF_RETTYPE binary_to_list_3(BIF_ALIST_3)
Uint start;
Uint stop;
Eterm* hp;
+ int reds_left;
+ int one_chunk;
if (is_not_binary(BIF_ARG_1)) {
goto error;
@@ -513,6 +537,21 @@ BIF_RETTYPE binary_to_list_3(BIF_ALIST_3)
goto error;
}
size = binary_size(BIF_ARG_1);
+ reds_left = ERTS_BIF_REDS_LEFT(BIF_P);
+ one_chunk = size < reds_left*ERTS_B2L_BYTES_PER_REDUCTION;
+ if (!one_chunk) {
+ if (size < L2B_B2L_MIN_EXEC_REDS*ERTS_B2L_BYTES_PER_REDUCTION) {
+ if (reds_left <= L2B_B2L_RESCHED_REDS) {
+ /* Yield and do it with full context reds... */
+ ERTS_BIF_YIELD3(bif_export[BIF_binary_to_list_3],
+ BIF_P, BIF_ARG_1, BIF_ARG_2, BIF_ARG_3);
+ }
+ /* Allow a bit more reductions... */
+ one_chunk = 1;
+ reds_left = L2B_B2L_MIN_EXEC_REDS;
+ }
+ }
+
ERTS_GET_BINARY_BYTES(BIF_ARG_1, bytes, bitoffs, bitsize);
if (start < 1 || start > size || stop < 1 ||
stop > size || stop < start ) {
@@ -520,7 +559,8 @@ BIF_RETTYPE binary_to_list_3(BIF_ALIST_3)
}
i = stop-start+1;
hp = HAlloc(BIF_P, 2*i);
- return binary_to_list(BIF_P, hp, NIL, bytes+start-1, i, bitoffs);
+ return binary_to_list(BIF_P, hp, NIL, bytes+start-1, i,
+ bitoffs, reds_left, one_chunk);
error:
BIF_ERROR(BIF_P, BADARG);
}
@@ -537,11 +577,27 @@ BIF_RETTYPE bitstring_to_list_1(BIF_ALIST_1)
byte* bytes;
Eterm previous = NIL;
Eterm* hp;
+ int reds_left;
+ int one_chunk;
if (is_not_binary(BIF_ARG_1)) {
BIF_ERROR(BIF_P, BADARG);
}
size = binary_size(BIF_ARG_1);
+ reds_left = ERTS_BIF_REDS_LEFT(BIF_P);
+ one_chunk = size < reds_left*ERTS_B2L_BYTES_PER_REDUCTION;
+ if (!one_chunk) {
+ if (size < L2B_B2L_MIN_EXEC_REDS*ERTS_B2L_BYTES_PER_REDUCTION) {
+ if (reds_left <= L2B_B2L_RESCHED_REDS) {
+ /* Yield and do it with full context reds... */
+ ERTS_BIF_YIELD1(bif_export[BIF_bitstring_to_list_1],
+ BIF_P, BIF_ARG_1);
+ }
+ /* Allow a bit more reductions... */
+ one_chunk = 1;
+ reds_left = L2B_B2L_MIN_EXEC_REDS;
+ }
+ }
ERTS_GET_REAL_BIN(BIF_ARG_1, real_bin, offset, bitoffs, bitsize);
bytes = binary_bytes(real_bin)+offset;
if (bitsize == 0) {
@@ -566,7 +622,8 @@ BIF_RETTYPE bitstring_to_list_1(BIF_ALIST_1)
hp += 2;
}
- return binary_to_list(BIF_P, hp, previous, bytes, size, bitoffs);
+ return binary_to_list(BIF_P, hp, previous, bytes, size,
+ bitoffs, reds_left, one_chunk);
}
@@ -795,8 +852,19 @@ static BIF_RETTYPE list_to_binary_continue(BIF_ALIST_1)
BIF_RETTYPE erts_list_to_binary_bif(Process *c_p, Eterm arg, Export *bif)
{
+ int orig_reds_left = ERTS_BIF_REDS_LEFT(c_p);
BIF_RETTYPE ret;
+ if (orig_reds_left < L2B_B2L_MIN_EXEC_REDS) {
+ if (orig_reds_left <= L2B_B2L_RESCHED_REDS) {
+ /* Yield and do it with full context reds... */
+ ERTS_BIF_PREP_YIELD1(ret, bif, c_p, arg);
+ return ret;
+ }
+ /* Allow a bit more reductions... */
+ orig_reds_left = L2B_B2L_MIN_EXEC_REDS;
+ }
+
if (is_nil(arg))
ERTS_BIF_PREP_RET(ret, new_binary(c_p, (byte *) "", 0));
else if (is_not_list(arg))
@@ -818,7 +886,6 @@ BIF_RETTYPE erts_list_to_binary_bif(Process *c_p, Eterm arg, Export *bif)
bif,
erts_iolist_size_yielding,
erts_iolist_to_buf_yielding);
- int orig_reds_left = ERTS_BIF_REDS_LEFT(c_p);
/*
* First try to do it all at once without having to use