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Code tagging and memory-allocation profiling [LWN.net] lwn.net - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from lwn.net Daily Mail and Mail on Sunday newspapers.
A slab allocator (removal) update [LWN.net] lwn.net - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from lwn.net Daily Mail and Mail on Sunday newspapers.
Out-of-memory victim selection with BPF [LWN.net] lwn.net - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from lwn.net Daily Mail and Mail on Sunday newspapers.
Kernel code can, at times, be quite inward looking; it often refers to itself. To enable this introspection, the kernel has evolved several mechanisms for identifying specific locations in the code and carrying out actions related to those locations. The code-tagging framework patch set, posted by Suren Baghdasaryan and Kent Overstreet, is an attempt to replace various ad hoc implementations with a single framework, and to add some new applications as well. ....
Memory management generally works at the level of pages, which typically contain 4,096 bytes but may be larger. The kernel, though, has extended the concept of pages to include compound pages, which are groups of contiguous single pages. That, in turn, has made the definition of what a "page" is a bit fuzzy. Matthew Wilcox has been working since last year on a concept called "page folios" which is meant to bring the picture back into focus; whether the memory-management community will accept it remains unclear, though. ....