10 Things Every Linux Programmer Should Know

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ResearchLabsLinuxKernelWorkshop, March2004 aboutUserspacevs. kernelspaceMemory allocationProcessesvs. threadsNPTL- Native POSIXThreadsLibraryOptimizationUsetherig htabstractionlayerforthejobWhy codingstyleis importantWhy youshouldalwayscheck forerrorsTherealcostof softwaredevelopmentPortabilityLinuxKerne lWorkshop, March2004 aboutThistalkis aboutcommonmisconceptions, andthingsIthinkevery aboutlearningfromotherpeople abouthow to s aboutknowinghow thingswork; Knowinghowthingswork opinions, andmineonly. Feelfreeto .LinuxKernelWorkshop, March2004 processis executingeitherin userspace, orin kernelspace. Dependingonwhichpriviledges, addressspaceandaddress(EIP)a processis executingin,we saythatit is eitherin userspace, userspace, a processhasnormalpriviledgesandcanandcan tdocertainthings.

User space vs. kernel space A process is executing either in user space, or in kernel space. Depending on which priviledges, address space and address (EIP) a process is executing in, we say

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