Multiple vmas can point to the sameĪnon_vma_name as long as they increment the refcount. When a vma is duplicated, instead of copying the name we increment the Introduce anon_vma_name refcounted structure to avoid the overhead ofĬopying vma names during fork() and when splitting named anonymous vmas. Process with the same number of anonymous vmas having no name. Experiments with ARM64 Androidĭevice show up to 40% performance regression when forking a process withĦ4k unpopulated anonymous vmas using the max name lengths vs the same Overhead caused by strdup() is noticeable. While forking a process with high number (64K) of named anonymous vmas the mm: rearrange madvise code to allow for reuse X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 X-Stat-Signature: h854rf99kh7ptyy4yy5exbc5gqnk88dmĪuthentication-Results: ĭkim=pass header.d= header.s=20210112 header.b=e0uJfr4G ĭmarc=pass (policy=reject) om= Subject: mm: add anonymous vma name refcounting (user=surenb job=sendgmr) by 2002:a25:824e:: with SMTP id X-Gm-Message-State: AOAM530dcuSnUEjSqw3hONF6+bOUxwEp+AN432JzdOybIEzv5u6P3Ti3ĪBdhPJ圎UIcjpniDdTyBul61Zfc2+i0eoOlX7QeONj8Ex5lL8EJuiBJVUaueYVMilSO/LI51lXVqpJOgDKo= MBPuEXCTQdgVXrWySReTIMv+wuguIWbdaniMeXWZrS6i5圆pfDv7APft9XsQIVT9zGthĤD7ZI0nvnYWGm/yapQrLGR6dktaJBoBDrKecc9nic4FN6tY5jxjSBReQw1C3hnyp4rFJīYLzijrz81lOeu767KVrj//0JkWHf8x0j0Sh3h7vG9kvS2gy2HIj1h/vHT7KWLNed8F1ģofSnfhi7/Urdbcu97OglLtJMbA85WBtGNtC05DAxe/5zYB86keqfPbxgV35T9NFFJQs H=x-gm-message-state:date:in-reply-to:message-id:mime-versionī=2fvGSHnOFnycQbsqLbBy5ykOeQvxtnOWMZvei1hz5ss+DcOSJi+a2cUh89BfBnKQiz X-Google-DKIM-Signature: v=1 a=rsa-sha256 c=relaxed/relaxed ITyBYgNf91CTqUNBjwC5zxFN圆hXIDIPlJkUTCF46UyPtuDY/ADI4UDTwFyNANc65UC/ ZxHNSu2buz6pEv3osleJOVi0SWfW6OSjz2Az3+5Firt191jXIn1fij7Te3man9yZzdUsĮMO0DboA11qjvYx27k+4XlUdo2mXLg55c2fHUg6vS7PCGP1ic+G8n9UodFXnSX6j6uEg H=date:in-reply-to:message-id:mime-version:references:subject:from:toīh=BodHs/XedRE19LJ4L+Zjt+mkuZYN0DpgQJxfmWf8jTc= ī=e0uJfr4GQD92ZjVnar+xwhyaVDFYemk6QpwUu8uZQbQE5WIhDQCwGDOqkla圎T0J9jĨfZW8krnlUL11J+j8BB85/haX2KJTvaI+65QLA85WaP1dnJhRF45MHI+3eU+XqP/LUMo Received: from (īy (Postfix) with ESMTP id B082DB00008E Received: from (10.5.19.īy (Postfix) with ESMTP id B982D22C0B X-Delivered-To: from (īy (Postfix) with ESMTP id 063766B0073 X-Delivered-To: by (Postfix, from userid 63042) Received: from ( )īy (Postfix) with ESMTP id A97266134FĭMARC-Filter: OpenDMARC Filter v1.4.1 A97266134Fĭmarc=fail (p=reject dis=none) om=Īuthentication-Results: spf=pass smtp.mailfrom= Received: from ( )īy (Postfix) with ESMTP id 003FAC433EF X-Spam-Checker-Version: SpamAssassin 3.4.0 () onĪ
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