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GET /api/1.0/patches/2175490/?format=api
{ "id": 2175490, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2175490/?format=api", "project": { "id": 41, "url": "http://patchwork.ozlabs.org/api/1.0/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": "" }, "msgid": "<22984336264c0cb2bad3c2459631ac14d4a890ac.1766051058.git.fweimer@redhat.com>", "date": "2025-12-18T10:17:52", "name": "[2/3] malloc: Only fill half of the tcache during batch allocation", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "41f4563beb42a866cf360de8f8b2d596fa825c85", "submitter": { "id": 14312, "url": "http://patchwork.ozlabs.org/api/1.0/people/14312/?format=api", "name": "Florian Weimer", "email": "fweimer@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/glibc/patch/22984336264c0cb2bad3c2459631ac14d4a890ac.1766051058.git.fweimer@redhat.com/mbox/", "series": [ { "id": 485815, "url": "http://patchwork.ozlabs.org/api/1.0/series/485815/?format=api", "date": "2025-12-18T10:17:02", "name": "malloc: batched frees", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/485815/mbox/" } ], "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2175490/checks/", "tags": {}, "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=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=bvYa+Bul;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=38.145.34.32; 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Thu, 18 Dec 2025 10:17:56 +0000 (UTC)", "from fweimer-oldenburg.csb.redhat.com (unknown [10.44.33.94])\n by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with\n ESMTPS\n id 5ACE71953986\n for <libc-alpha@sourceware.org>; Thu, 18 Dec 2025 10:17:55 +0000 (UTC)" ], "DKIM-Filter": [ "OpenDKIM Filter v2.11.0 sourceware.org 3DA384BA2E2B", "OpenDKIM Filter v2.11.0 sourceware.org 900A54BA2E25" ], "DMARC-Filter": "OpenDMARC Filter v1.4.2 sourceware.org 900A54BA2E25", "ARC-Filter": "OpenARC Filter v1.0.0 sourceware.org 900A54BA2E25", "ARC-Seal": "i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1766053078; cv=none;\n b=C1CzxTkuf4z7cr2UoHidLrG5dg7IaHzOl18aSj+PJhGUnBC8s4SPBsxAOjtW4Ea4loF0jmlhI89K5JW2spxQo0YnkI6RMmS/Bb7OcxfRcsQAQw3l0BhbOfA6ZE397ipfJ6q3QFj6EImVpbrTYKG0IfgM1dVh5/rp73WKimB5FzM=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1766053078; c=relaxed/simple;\n bh=goYBhFxyiIXci6huuIfSbxWZnhEUaEuUto1PqvmI/YM=;\n h=DKIM-Signature:From:To:Subject:Message-ID:Date:MIME-Version;\n b=MV3JGodplascz96Krdrd1me0v4atyrUTZ9AGa4GhBuHvUSFBpzEt1h8cALU4KkzFfLhyHso+f7uzBYBPfFgoC75kTiJPMbBfm+V9bpF43nhyw7YIePNigVFuh8pw1jB09IFe8Bp+722iVs+LLz4rkww2XoKWuCud1RrDzIVBLzA=", "ARC-Authentication-Results": "i=1; server2.sourceware.org", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1766053078;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:mime-version:mime-version:content-type:content-type:\n in-reply-to:in-reply-to:references:references;\n bh=8QaJkGFaQhr+gicLSON/F0BqcIL5HHIdj/oqO+VKk9g=;\n b=bvYa+BulGHWLqboOPYAbeK+8RKdWLznKmn7CBWRqWSaJ30S9EA4tUaybGq4VMO7i5Y7Z4R\n s2vSu4l7Xos4haLdoTpPaopFQoy0L/+OOJ4Hc7Bc4LWRFEnfyjppveOJK5pV9ckn+dMKI7\n bgJY1vJN8XRMPhbcyCSIlLw/K9yvd20=", "X-MC-Unique": "sw9u239PMHqXlP_LQimw0Q-1", "X-Mimecast-MFC-AGG-ID": "sw9u239PMHqXlP_LQimw0Q_1766053076", "From": "Florian Weimer <fweimer@redhat.com>", "To": "libc-alpha@sourceware.org", "Subject": "[PATCH 2/3] malloc: Only fill half of the tcache during batch\n allocation", "In-Reply-To": "<cover.1766051058.git.fweimer@redhat.com>", "Message-ID": "\n <22984336264c0cb2bad3c2459631ac14d4a890ac.1766051058.git.fweimer@redhat.com>", "References": "<cover.1766051058.git.fweimer@redhat.com>", "X-From-Line": "22984336264c0cb2bad3c2459631ac14d4a890ac Mon Sep 17 00:00:00 2001", "Date": "Thu, 18 Dec 2025 11:17:52 +0100", "User-Agent": "Gnus/5.13 (Gnus v5.13)", "MIME-Version": "1.0", "X-Scanned-By": "MIMEDefang 3.0 on 10.30.177.12", "X-Mimecast-Spam-Score": "0", "X-Mimecast-MFC-PROC-ID": "1l6-RAO_GNsVOQcXNmFKq_blCrC0H_V1sdFH-MHqBE8_1766053076", "X-Mimecast-Originator": "redhat.com", "Content-Type": "text/plain", "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": "This leaves room for subsequent frees.\n---\n malloc/malloc.c | 14 ++++++++++----\n 1 file changed, 10 insertions(+), 4 deletions(-)", "diff": "diff --git a/malloc/malloc.c b/malloc/malloc.c\nindex d2184c8d7a..d42f0183e3 100644\n--- a/malloc/malloc.c\n+++ b/malloc/malloc.c\n@@ -3940,8 +3940,11 @@ _int_malloc (mstate av, size_t bytes)\n \t if (__glibc_unlikely (tcache_inactive ()))\n \t\ttcache_init (av);\n \n-\t /* While bin not empty and tcache not full, copy chunks over. */\n-\t while (tcache->num_slots[tc_idx] != 0\n+\t /* While bin not empty and tcache not full, copy chunks over.\n+\t\t Only fill half of the tcache, so that subsequent frees\n+\t\t do not immediately flush the tcache. */\n+\t unsigned int tcache_target_count = mp_.tcache_count / 2;\n+\t while (tcache->num_slots[tc_idx] > tcache_target_count\n \t\t && (tc_victim = last (bin)) != bin)\n \t\t{\n \t\t if (tc_victim != NULL)\n@@ -3988,6 +3991,7 @@ _int_malloc (mstate av, size_t bytes)\n if (tc_idx < mp_.tcache_small_bins)\n tcache_nb = nb;\n int return_cached = 0;\n+ unsigned int tcache_target_count = mp_.tcache_count / 2;\n \n tcache_unsorted_count = 0;\n #endif\n@@ -4066,9 +4070,11 @@ _int_malloc (mstate av, size_t bytes)\n \t if (__glibc_unlikely (tcache_inactive ()))\n \t\ttcache_init (av);\n \t /* Fill cache first, return to user only if cache fills.\n-\t\t We may return one of these chunks later. */\n+\t\t We may return one of these chunks later. Only fill\n+\t\t half of tcache, so that subsequent frees do not flush\n+\t\t it immediately. */\n \t if (tcache_nb > 0\n-\t\t && tcache->num_slots[tc_idx] != 0)\n+\t\t && tcache->num_slots[tc_idx] > tcache_target_count)\n \t\t{\n \t\t tcache_put (victim, tc_idx);\n \t\t return_cached = 1;\n", "prefixes": [ "2/3" ] }