From patchwork Sun Sep 25 10:51:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 609139 Delivered-To: patch@linaro.org Received: by 2002:a17:522:c983:b0:460:3032:e3c4 with SMTP id kr3csp1273915pvb; Sun, 25 Sep 2022 04:11:33 -0700 (PDT) X-Google-Smtp-Source: AMsMyM7mIrRUMqTn2wEhXAHq3984qBrvXCXzVQua0CbFrCtrZoMNvN+Hm6HsKv4ASTa/lqOY/Xab X-Received: by 2002:a05:6214:3005:b0:4ad:8042:128a with SMTP id ke5-20020a056214300500b004ad8042128amr13190169qvb.66.1664104293256; Sun, 25 Sep 2022 04:11:33 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1664104293; cv=none; d=google.com; s=arc-20160816; b=us9cAH7De7am7OENsslpWWlezLDI5if9f3DHLIIhR/6oXjWLGDj20XdSs0OwNY0a4f tZYptLoctkdHc+0vqVfPHK8OQMlAh8tae1CHBxsjUoj+jBA6fzIo1J+r9aMjWQMiUR6o RFcgg6HVWE+bAwDPmKaSYFjo1YVzCjP1LM4aoO96keCYBxxhmo626GTBufFbjgJp9Fgb 6PeH3G3vzK9Qwkhf3+t25aSOxdR95kBUOO2hj+EDMUbXn2yYoHOH+0mpM8tVEMcnzICd GTQv2x5xWP8SHEzBwzfrL9uB454aE9EpXKbRJX84EveT7w3f0w93/ri408fOkSUiO8Wc WPEQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:list-subscribe:list-help:list-post:list-archive :list-unsubscribe:list-id:precedence:content-transfer-encoding :mime-version:references:in-reply-to:message-id:date:subject:to:from :dkim-signature; bh=IxU+2TcSPxOMpzbbtR4F1GZkdhXK0yr1aP3EanHShgc=; b=T2HmwlQUdJoUDA5l3qzam9DYqizzQiDtKUWCBXuchF/p+F5D0e6s3Sht81kTPt1z4A GeUMF8tsS2uwbh+AN4/Sr1z3J7Mka5EW/HGkAR+vnOXzfBLybAjo6lTLNeVxSqtX08ir iCj0cCzJntOZ2+lPIklTxC9tUgvaJN3qE0p38Mw2U9ORm6824XK2l5hoe+lxRFF1ubxJ 8UctRnSF7NNJ2e4gmpwzd/GjHNgiYXs8raRLRjRUTGta5xFcXBKNrOdjpePgTKeFLCHP t25asPZsPUWQzALK/grYzJvTV+qr1OQMV4HRioUJOIM46IZiYhs3MbYX4AlYK63ZB8Qs Wc3g== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=Anhpt+ZL; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org. [209.51.188.17]) by mx.google.com with ESMTPS id u1-20020a05620a0c4100b006cf2a95a11bsi8446649qki.125.2022.09.25.04.11.33 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sun, 25 Sep 2022 04:11:33 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=Anhpt+ZL; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1]:45328 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ocPXo-0004yM-Pv for patch@linaro.org; Sun, 25 Sep 2022 07:11:32 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50906) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ocPEz-00037J-Lp for qemu-devel@nongnu.org; Sun, 25 Sep 2022 06:52:05 -0400 Received: from mail-qv1-xf29.google.com ([2607:f8b0:4864:20::f29]:38814) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1ocPEx-0000NZ-W8 for qemu-devel@nongnu.org; Sun, 25 Sep 2022 06:52:05 -0400 Received: by mail-qv1-xf29.google.com with SMTP id i15so2792523qvp.5 for ; Sun, 25 Sep 2022 03:52:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date; bh=IxU+2TcSPxOMpzbbtR4F1GZkdhXK0yr1aP3EanHShgc=; b=Anhpt+ZLvEc133rrfsXafacjjoK4Yjmcx3n9A3CqiUjpxJtcfQ58UT3rgiq76nTKDv xOs2SnCYtJz+vAqKcc17tSQlraIbiBZ1UwC4wDeaE1EI+wn1KyjfyeuuNZZ86KDUxffl K05QvgH2GpUICs3vl/q8na6Stt2u3xwLlK2W0r1nswvnbkJdwYI0s/GOYRDJJPJrQwxM Clm+JHXl+wWwK6WfBRKIyTLv1ZNzRU5DKNcfH3h6jEULjmT8yjT2bZTSBxK+3cEW0FSj hhMWw+CzWFOBnyec1xqNciZXc+9ICohl70MNKgf7mTLUWTrVnN7d4RpL9thdf1BpyGnP yC7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date; bh=IxU+2TcSPxOMpzbbtR4F1GZkdhXK0yr1aP3EanHShgc=; b=0agz0YerAiGt5ewVJOXFAfwadsgBFaTg+zsiV0L98NbA2FYHFjNKlOp44rlJaNmd+0 Q+bFnMF7e6o2YXIeY5M9/ZQycRyqGjQreMXjjcSc1OyPLtdn0tqaoYxZxhuIe0Z1Dbah LVBr4YTy9Msn2D7YJnrTtrUFSopKMkUTgOkiwBciqR7Kis6zsoZJOtQKBlgzVUzw7v2p +QewrrPbfg3YeKyjuXW7QN6rtIIeTkuQ+8fsOnkeNFil+Jcw7ohGIwJsgV0m9WcVJCpP m3s2+1yrAwj0QrEZNdnsEWt4+8ZGUNlsz1rdg3uNBeo8fPI5p8fnmWxOre+P1Ii3mA/R PwLQ== X-Gm-Message-State: ACrzQf09z9VObFfbFY3FcBTPpA6HoNQGRYaNNVMb7v10tibitwLVMRV9 ME1vj/YXoQBq9QhcxLn+cCdbkQvUPE/hUg== X-Received: by 2002:a05:6214:4001:b0:474:1516:5372 with SMTP id kd1-20020a056214400100b0047415165372mr13544873qvb.96.1664103123038; Sun, 25 Sep 2022 03:52:03 -0700 (PDT) Received: from stoup.. ([2605:ef80:80a9:5c0e:1ec2:d482:4986:8538]) by smtp.gmail.com with ESMTPSA id u15-20020a05620a0c4f00b006cf19068261sm10061132qki.116.2022.09.25.03.52.01 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Sep 2022 03:52:02 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v5 10/17] accel/tcg: Remove PageDesc code_bitmap Date: Sun, 25 Sep 2022 10:51:17 +0000 Message-Id: <20220925105124.82033-11-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220925105124.82033-1-richard.henderson@linaro.org> References: <20220925105124.82033-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::f29; envelope-from=richard.henderson@linaro.org; helo=mail-qv1-xf29.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" This bitmap is created and discarded immediately. We gain nothing by its existence. Signed-off-by: Richard Henderson Message-Id: <20220822232338.1727934-2-richard.henderson@linaro.org> Reviewed-by: Alex Bennée --- accel/tcg/translate-all.c | 78 ++------------------------------------- 1 file changed, 4 insertions(+), 74 deletions(-) diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c index f5e8592d4a..9046ea80f7 100644 --- a/accel/tcg/translate-all.c +++ b/accel/tcg/translate-all.c @@ -102,21 +102,14 @@ #define assert_memory_lock() tcg_debug_assert(have_mmap_lock()) #endif -#define SMC_BITMAP_USE_THRESHOLD 10 - typedef struct PageDesc { /* list of TBs intersecting this ram page */ uintptr_t first_tb; -#ifdef CONFIG_SOFTMMU - /* in order to optimize self modifying code, we count the number - of lookups we do to a given page to use a bitmap */ - unsigned long *code_bitmap; - unsigned int code_write_count; -#else +#ifdef CONFIG_USER_ONLY unsigned long flags; void *target_data; #endif -#ifndef CONFIG_USER_ONLY +#ifdef CONFIG_SOFTMMU QemuSpin lock; #endif } PageDesc; @@ -907,17 +900,6 @@ void tb_htable_init(void) qht_init(&tb_ctx.htable, tb_cmp, CODE_GEN_HTABLE_SIZE, mode); } -/* call with @p->lock held */ -static inline void invalidate_page_bitmap(PageDesc *p) -{ - assert_page_locked(p); -#ifdef CONFIG_SOFTMMU - g_free(p->code_bitmap); - p->code_bitmap = NULL; - p->code_write_count = 0; -#endif -} - /* Set to NULL all the 'first_tb' fields in all PageDescs. */ static void page_flush_tb_1(int level, void **lp) { @@ -932,7 +914,6 @@ static void page_flush_tb_1(int level, void **lp) for (i = 0; i < V_L2_SIZE; ++i) { page_lock(&pd[i]); pd[i].first_tb = (uintptr_t)NULL; - invalidate_page_bitmap(pd + i); page_unlock(&pd[i]); } } else { @@ -1197,11 +1178,9 @@ static void do_tb_phys_invalidate(TranslationBlock *tb, bool rm_from_page_list) if (rm_from_page_list) { p = page_find(tb->page_addr[0] >> TARGET_PAGE_BITS); tb_page_remove(p, tb); - invalidate_page_bitmap(p); if (tb->page_addr[1] != -1) { p = page_find(tb->page_addr[1] >> TARGET_PAGE_BITS); tb_page_remove(p, tb); - invalidate_page_bitmap(p); } } @@ -1246,35 +1225,6 @@ void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr) } } -#ifdef CONFIG_SOFTMMU -/* call with @p->lock held */ -static void build_page_bitmap(PageDesc *p) -{ - int n, tb_start, tb_end; - TranslationBlock *tb; - - assert_page_locked(p); - p->code_bitmap = bitmap_new(TARGET_PAGE_SIZE); - - PAGE_FOR_EACH_TB(p, tb, n) { - /* NOTE: this is subtle as a TB may span two physical pages */ - if (n == 0) { - /* NOTE: tb_end may be after the end of the page, but - it is not a problem */ - tb_start = tb->pc & ~TARGET_PAGE_MASK; - tb_end = tb_start + tb->size; - if (tb_end > TARGET_PAGE_SIZE) { - tb_end = TARGET_PAGE_SIZE; - } - } else { - tb_start = 0; - tb_end = ((tb->pc + tb->size) & ~TARGET_PAGE_MASK); - } - bitmap_set(p->code_bitmap, tb_start, tb_end - tb_start); - } -} -#endif - /* add the tb in the target page and protect it if necessary * * Called with mmap_lock held for user-mode emulation. @@ -1295,7 +1245,6 @@ static inline void tb_page_add(PageDesc *p, TranslationBlock *tb, page_already_protected = p->first_tb != (uintptr_t)NULL; #endif p->first_tb = (uintptr_t)tb | n; - invalidate_page_bitmap(p); #if defined(CONFIG_USER_ONLY) /* translator_loop() must have made all TB pages non-writable */ @@ -1357,10 +1306,8 @@ tb_link_page(TranslationBlock *tb, tb_page_addr_t phys_pc, /* remove TB from the page(s) if we couldn't insert it */ if (unlikely(existing_tb)) { tb_page_remove(p, tb); - invalidate_page_bitmap(p); if (p2) { tb_page_remove(p2, tb); - invalidate_page_bitmap(p2); } tb = existing_tb; } @@ -1731,7 +1678,6 @@ tb_invalidate_phys_page_range__locked(struct page_collection *pages, #if !defined(CONFIG_USER_ONLY) /* if no code remaining, no need to continue to use slow writes */ if (!p->first_tb) { - invalidate_page_bitmap(p); tlb_unprotect_code(start); } #endif @@ -1827,24 +1773,8 @@ void tb_invalidate_phys_page_fast(struct page_collection *pages, } assert_page_locked(p); - if (!p->code_bitmap && - ++p->code_write_count >= SMC_BITMAP_USE_THRESHOLD) { - build_page_bitmap(p); - } - if (p->code_bitmap) { - unsigned int nr; - unsigned long b; - - nr = start & ~TARGET_PAGE_MASK; - b = p->code_bitmap[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG - 1)); - if (b & ((1 << len) - 1)) { - goto do_invalidate; - } - } else { - do_invalidate: - tb_invalidate_phys_page_range__locked(pages, p, start, start + len, - retaddr); - } + tb_invalidate_phys_page_range__locked(pages, p, start, start + len, + retaddr); } #else /* Called with mmap_lock held. If pc is not 0 then it indicates the