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Fri, 30 Jun 2023 06:22:13 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: mjt@tls.msk.ru, laurent@vivier.eu Subject: [PATCH 16/24] linux-user: Use page_find_range_empty for mmap_find_vma_reserved Date: Fri, 30 Jun 2023 15:21:51 +0200 Message-Id: <20230630132159.376995-17-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230630132159.376995-1-richard.henderson@linaro.org> References: <20230630132159.376995-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::42b; envelope-from=richard.henderson@linaro.org; helo=mail-wr1-x42b.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, T_SCC_BODY_TEXT_LINE=-0.01 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1688131405829100003 Content-Type: text/plain; charset="utf-8" Use the interval tree to find empty space, rather than probing each page in turn. Signed-off-by: Richard Henderson --- linux-user/mmap.c | 46 ++++++---------------------------------------- 1 file changed, 6 insertions(+), 40 deletions(-) diff --git a/linux-user/mmap.c b/linux-user/mmap.c index e332555dd2..6ecdf9e56d 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -317,49 +317,15 @@ unsigned long last_brk; static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size, abi_ulong align) { - abi_ulong addr, end_addr, incr =3D qemu_host_page_size; - int prot; - bool looped =3D false; + target_ulong ret; =20 - if (size > reserved_va) { - return (abi_ulong)-1; + ret =3D page_find_range_empty(start, reserved_va, size, align); + if (ret =3D=3D -1 && start > mmap_min_addr) { + /* Restart at the beginning of the address space. */ + ret =3D page_find_range_empty(mmap_min_addr, start - 1, size, alig= n); } =20 - /* Note that start and size have already been aligned by mmap_find_vma= . */ - - end_addr =3D start + size; - if (start > reserved_va - size) { - /* Start at the top of the address space. */ - end_addr =3D ((reserved_va + 1 - size) & -align) + size; - looped =3D true; - } - - /* Search downward from END_ADDR, checking to see if a page is in use.= */ - addr =3D end_addr; - while (1) { - addr -=3D incr; - if (addr > end_addr) { - if (looped) { - /* Failure. The entire address space has been searched. = */ - return (abi_ulong)-1; - } - /* Re-start at the top of the address space. */ - addr =3D end_addr =3D ((reserved_va + 1 - size) & -align) + si= ze; - looped =3D true; - } else { - prot =3D page_get_flags(addr); - if (prot) { - /* Page in use. Restart below this page. */ - addr =3D end_addr =3D ((addr - size) & -align) + size; - } else if (addr && addr + size =3D=3D end_addr) { - /* Success! All pages between ADDR and END_ADDR are free.= */ - if (start =3D=3D mmap_next_start) { - mmap_next_start =3D addr; - } - return addr; - } - } - } + return ret; } =20 /* --=20 2.34.1