This white paper by Jesse Hertz [PDF] examines various ways to compromise and escape from containers on Linux systems. "A common configuration for companies offering PaaS solutions built on containers is to have multiple customers’ containers running on the same physical host. By default, both LXC and Docker setup container networking so that all containers share the same Linux virtual bridge. The

On 06/09/2015 04:18 AM, Romain Francoise wrote: > Hi, > > On Tue, May 19, 2015 at 01:55:21PM -0700, Tahsin Erdogan wrote: >> --- a/block/cfq-iosched.c >> +++ b/block/cfq-iosched.c >> @@ -4460,7 +4460,7 @@ static int cfq_init_queue(struct request_queue *q, struct elevator_type *e) >> cfqd->cfq_slice[1] = cfq_slice_sync; >> cfqd->cfq_target_latency = cfq_target_latency; >> cfqd->cfq_slice_async_rq =

In computer science, read-copy-update (RCU) is a synchronization mechanism that avoids the use of lock primitives while multiple threads concurrently read and update elements that are linked through pointers and that belong to shared data structures (e.g., linked lists, trees, hash tables).[1] Whenever a thread is inserting or deleting elements of data structures in shared memory, all readers are

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BFQ is a proportional-share storage-I/O scheduler that also supports cgroups. Available in Linux since 4.12, BFQ features the following performance (benchmark results here), on any type of storage medium (embedded flash storage, HDDs, SATA or NVMe SSDs, ...) and on systems ranging from minimal embedded systems to high-end servers: Low latency for interactive tasks Under load, BFQ loads application

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