File 2411-erts-Make-re-copy-small-subbinaries.patch of Package erlang

Overview Repositories Revisions Requests Users Attributes Meta

File 2411-erts-Make-re-copy-small-subbinaries.patch of Package erlang (Revision 20341d3ca8beab07b502d76ce8eb2b1a)

Currently displaying revision 20341d3ca8beab07b502d76ce8eb2b1a , Show latest

From ce10900488ac79db29655e468a8f945846181bb2 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Mon, 30 Aug 2021 16:06:19 +0200
Subject: [PATCH] erts: Make re copy small subbinaries

Because small subbinaries can be converted to heapbinaries
during GC, we do not want to have references to those in the
re state, so we copy any binary that is small enough to fit
on the heap.

Closes #5150
---
 erts/emulator/beam/erl_bif_re.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/erts/emulator/beam/erl_bif_re.c b/erts/emulator/beam/erl_bif_re.c
index bbc64eb9aa..f990a99547 100644
--- a/erts/emulator/beam/erl_bif_re.c
+++ b/erts/emulator/beam/erl_bif_re.c
@@ -1292,7 +1292,7 @@ re_run(Process *p, Eterm arg1, Eterm arg2, Eterm arg3)
     }
 
     /*  Optimized - if already in binary off heap, keep that and avoid
-       copying, also binary returns can be sub binaries in that case */
+        copying, also binary returns can be sub binaries in that case. */
 
     restart.flags = 0;
     if (is_binary(arg1)) {
@@ -1307,7 +1307,10 @@ re_run(Process *p, Eterm arg1, Eterm arg2, Eterm arg3)
 
 	slength = binary_size(arg1);
 	bptr = binary_val(real_bin);
-	if (bitsize != 0 || bitoffs != 0 ||  (*bptr != HEADER_PROC_BIN)) {
+	if (bitsize != 0 || bitoffs != 0 || slength <= ERL_ONHEAP_BIN_LIMIT) {
+            /* If this is an unaligned subbinary,
+               or the binary is smaller than the ERL_ONHEAP_BIN_LIMIT
+               we make a copy of the binary. */
 	    goto handle_iolist;
 	}
 	pb = (ProcBin *) bptr;
-- 
2.31.1

Places

File 2411-erts-Make-re-copy-small-subbinaries.patch of Package erlang (Revision 20341d3ca8beab07b502d76ce8eb2b1a)

Places