Memory part 5: What programmers can do [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! [Editor's note: welcome to part 5 of Ulrich Drepper's "What every programmer should know about memory". This part is the first half of section 6, which di
[Linux][Android] Analyzing Memory Usage.
First of all, I am going to avoid methods that using ‘Shell’ command, because in embedded environment(embedded linux like Android), we cannot expect full-functioned shell (ex. bash, tcsh etc). Before talking about memory analysis, let’s look over fundamental concepts related with memory. (This article is written based on Kernel 2.6.29) There are 4 type of memory. private clean, private dirty, shar
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ELC: How much memory are applications really using? [LWN.net]
ELC: How much memory are applications really using? Anybody who has tried to figure out why a Linux system is running short of memory can attest that the memory usage information made available by the kernel is, at best, difficult to use. Matt Mackall has recently been working on a set of patches aimed at improving this situation. Given the constraints imposed by embedded Linux systems, it is not
革命の日々！ PSSとUSS
http://journal.mycom.co.jp/news/2008/04/18/007/index.html プロセス管理機構も見直され、プロセスごとのメモリ使用量をかんたんに測定できる機能が追加された。カーネル2.6.25では、プロセスが使用するページに対応する物理ページ配置をプロセスごとに/proc/$PID/pagemapsとして作成、これを他のプロセスと比較することで共有するページを判別できる。共有ページを共有しているプロセスの数で除した数値を持つ「proportional set size (PSS)」と、共有されていないページをカウントした「unique set size (USS)」という2つの統計値も新設された。 この説明はへんだ。 カーネル内にUSSという統計値は存在しない。また、pagemapsというファイルは存在しない（pagemapだ） pagemapはページ
Memory part 2: CPU caches [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! [Editor's note: This is the second installment in Ulrich Drepper's "What every programmer should know about memory" document. Those who have not read the
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