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Current commodity operating systems allow a privileged user to run some programs in kernel mode by installing a kernel module or a device driver, but there isnpsilat an available method to verify the reliability of these programs. As a result, malware leverages this way to corrupt system services, defeat anti-malware and even get control of the whole system. It makes operating-system-based security...
It is trendy that virtualization technology is adopted by server and desktop computers recently. Binary translation is an important method to implement full virtualization supporting any guest operating system without modification. Traditional methods use trap or interrupt to catch sensitive instruction's execution. Its performance is influenced by trap's context switch overhead. This article proposes...
Bearing a total organic carbon (TOC) content of 9.3–10.7 kg C/m 2 , alpine grassland soils of the Qinghai–Tibet plateau's permafrost region bear a greater organic carbon pool than do grassland soils in other regions of China or than tropical savannah soils. The easily released light fraction organic carbon (LFOC) accounts for 34–54% of the TOC and is particularly enriched in the topsoil (0–0...
To meet increasing QoS requirements of Web applications it is vital to design an efficient Web server. This article describes a pipeline server architecture, which can get intra-request parallelism. Based on control theory, we adopt predictor and feedback control methods to allocate threads of each stage dynamically. As a result, server can satisfy variant workloads adaptively. With the help of these...
This paper presents the architectural and implementation details of multithreading in kylin operating system. This system provides a foundation for efficient and flexible threads on both uniprocessor and multiprocessor machines. The work is based on the scheduler activations kernel interface proposed by Anderson et al. (1992) for user-level control of parallelism in the presence of multiprogramming...
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