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GET /api/patches/2218731/?format=api
{ "id": 2218731, "url": "http://patchwork.ozlabs.org/api/patches/2218731/?format=api", "web_url": "http://patchwork.ozlabs.org/project/glibc/patch/PAWPR08MB89823E55DF017C08A84975DF8350A@PAWPR08MB8982.eurprd08.prod.outlook.com/", "project": { "id": 41, "url": "http://patchwork.ozlabs.org/api/projects/41/?format=api", "name": "GNU C Library", "link_name": "glibc", "list_id": "libc-alpha.sourceware.org", "list_email": "libc-alpha@sourceware.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<PAWPR08MB89823E55DF017C08A84975DF8350A@PAWPR08MB8982.eurprd08.prod.outlook.com>", "list_archive_url": null, "date": "2026-04-01T20:10:57", "name": "malloc: Remove dynamic mmap/trim threshold [BZ #30769]", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "bd3281508275f68a5c963b42df08be1cbd1a9bbc", "submitter": { "id": 67598, "url": "http://patchwork.ozlabs.org/api/people/67598/?format=api", "name": "Wilco Dijkstra", "email": "Wilco.Dijkstra@arm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/glibc/patch/PAWPR08MB89823E55DF017C08A84975DF8350A@PAWPR08MB8982.eurprd08.prod.outlook.com/mbox/", "series": [ { "id": 498382, "url": "http://patchwork.ozlabs.org/api/series/498382/?format=api", "web_url": "http://patchwork.ozlabs.org/project/glibc/list/?series=498382", "date": "2026-04-01T20:10:57", "name": "malloc: Remove dynamic mmap/trim threshold [BZ #30769]", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498382/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2218731/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2218731/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "libc-alpha@sourceware.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "libc-alpha@sourceware.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=JcfzUY/Q;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=JcfzUY/Q;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=2620:52:6:3111::32; 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Ip=[4.158.2.129];\n Helo=[outbound-uk1.az.dlp.m.darktrace.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n AM3PEPF0000A794.eurprd04.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Anonymous", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-BeenThere": "libc-alpha@sourceware.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Libc-alpha mailing list <libc-alpha.sourceware.org>", "List-Unsubscribe": "<https://sourceware.org/mailman/options/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=unsubscribe>", "List-Archive": "<https://sourceware.org/pipermail/libc-alpha/>", "List-Post": "<mailto:libc-alpha@sourceware.org>", "List-Help": "<mailto:libc-alpha-request@sourceware.org?subject=help>", "List-Subscribe": "<https://sourceware.org/mailman/listinfo/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=subscribe>", "Errors-To": "libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org" }, "content": "Whenever a large mmap is released the mmap and trim thresholds are updated.\nAs a result these thresholds grow ever larger which means huge allocations\nare always served by arenas rather than mmap. The thresholds can end up as\nlarge as an arena, which completely stops all trimming of the top block.\nRemove the code completely - the default thresholds seem way too low for\nmodern 64-bit targets, but they can be increased separately.\n\nPasses regress - OK for commit?\n\n---", "diff": "diff --git a/malloc/malloc.c b/malloc/malloc.c\nindex 6a888b0eb7de53ae7b814275e86d2bd2f06b5e53..8b7a414ab8d2c0f84ba7be7449a7909d1930d325 100644\n--- a/malloc/malloc.c\n+++ b/malloc/malloc.c\n@@ -1770,10 +1770,6 @@ struct malloc_par\n int n_mmaps;\n int n_mmaps_max;\n int max_n_mmaps;\n- /* the mmap_threshold is dynamic, until the user sets\n- it manually, at which point we need to disable any\n- dynamic behavior. */\n- int no_dyn_threshold;\n \n /* Statistics */\n INTERNAL_SIZE_T mmapped_mem;\n@@ -4291,18 +4287,6 @@ _int_free_chunk (mstate av, mchunkptr p, INTERNAL_SIZE_T size, int have_lock)\n /* Preserve errno in case munmap sets it. */\n int err = errno;\n \n- /* See if the dynamic brk/mmap threshold needs adjusting.\n- Dumped fake mmapped chunks do not affect the threshold. */\n- if (!mp_.no_dyn_threshold\n- && chunksize_nomask (p) > mp_.mmap_threshold\n- && chunksize_nomask (p) <= DEFAULT_MMAP_THRESHOLD_MAX)\n- {\n- mp_.mmap_threshold = chunksize (p);\n- mp_.trim_threshold = 2 * mp_.mmap_threshold;\n- LIBC_PROBE (memory_mallopt_free_dyn_thresholds, 2,\n-\t\t mp_.mmap_threshold, mp_.trim_threshold);\n- }\n-\n munmap_chunk (p);\n \n __set_errno (err);\n@@ -4901,40 +4885,32 @@ __malloc_stats (void)\n static __always_inline int\n do_set_trim_threshold (size_t value)\n {\n- LIBC_PROBE (memory_mallopt_trim_threshold, 3, value, mp_.trim_threshold,\n-\t mp_.no_dyn_threshold);\n+ LIBC_PROBE (memory_mallopt_trim_threshold, 2, value, mp_.trim_threshold);\n mp_.trim_threshold = value;\n- mp_.no_dyn_threshold = 1;\n return 1;\n }\n \n static __always_inline int\n do_set_top_pad (size_t value)\n {\n- LIBC_PROBE (memory_mallopt_top_pad, 3, value, mp_.top_pad,\n-\t mp_.no_dyn_threshold);\n+ LIBC_PROBE (memory_mallopt_top_pad, 2, value, mp_.top_pad);\n mp_.top_pad = value;\n- mp_.no_dyn_threshold = 1;\n return 1;\n }\n \n static __always_inline int\n do_set_mmap_threshold (size_t value)\n {\n- LIBC_PROBE (memory_mallopt_mmap_threshold, 3, value, mp_.mmap_threshold,\n-\t mp_.no_dyn_threshold);\n+ LIBC_PROBE (memory_mallopt_mmap_threshold, 2, value, mp_.mmap_threshold);\n mp_.mmap_threshold = value;\n- mp_.no_dyn_threshold = 1;\n return 1;\n }\n \n static __always_inline int\n do_set_mmaps_max (int32_t value)\n {\n- LIBC_PROBE (memory_mallopt_mmap_max, 3, value, mp_.n_mmaps_max,\n-\t mp_.no_dyn_threshold);\n+ LIBC_PROBE (memory_mallopt_mmap_max, 2, value, mp_.n_mmaps_max);\n mp_.n_mmaps_max = value;\n- mp_.no_dyn_threshold = 1;\n return 1;\n }\n \n", "prefixes": [] }