Unix, Linux, DevOps , Cloud computing and BigData Knowledge-Base


Announcing Amazon EC2 H1 Instances Price Reduction

We are reducing the On-Demand and Reserved Instance prices for Amazon EC2 H1 Instances in the US East (N. Virginia), US East (Ohio), US West (Oregon) and Europe (Ireland) Regions by 15%. These changes will take effect immediately. Continue Reading — Announcing Amazon EC2 H1...


[$] Is it time to remove ZONE_DMA?

The DMA zone (ZONE_DMA) is a memory-management holdover from the distant past. Once upon a time, many devices (those on the ISA bus in particular) could only use 24 bits for DMA addresses, and were thus limited to the bottom 16MB of memory… Continue Reading —...


[$] Reworking page-table traversal

A system’s page tables are organized into a tree that is as many as five levels deep. In many ways those levels are all similar, but the kernel treats them all as being different, with the result that page-table manipulations include a fair amo… Continue...


[$] get_user_pages() continued

At a plenary session held relatively early during the 2018 Linux Storage, Filesystem, and Memory-Management Summit, the developers discussed a number of problems with the kernel’s get_user_pages() interface. During the waning hours of LSFMM, a … Continue Reading — [$] get_user_pages() continued


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