On Tue, 12 Jan 2016 11:05:45 -0500 "Martin K. Petersen" <martin.petersen@xxxxxxxxxx> wrote: > The annual Linux Storage, Filesystem and Memory Management Summit for > 2016 will be held on April 18th and 19th at the Raleigh Marriott City > center, Raleigh, NC. > [...] > > 2) Requests to attend the summit should be sent to: > > lsf-pc@xxxxxxxxxxxxxxxxxxxxxxxxxx > > Please summarise what expertise you will bring to the meeting, and what > you would like to discuss. Please also tag your email with [LSF/MM > ATTEND] so there is less chance of it getting lost. Hi committee, I would like to participate in LSF/MM. I've over the last year optimized the SLAB+SLUB allocators, specifically by introducing a bulking API. This work is almost complete, but I have some more ideas in the MM-area that I would like to discuss with people. Specifically I have the following ideas: 1. Speedup *SLUB* with approx 10-20% by using per CPU detached freelists for all types of allocations/free. * Actually have a prove-of-concept implementation that showed 20% speedup * Idea is every page (used-by SLUB) gets a detached freelist * The first CPU that alloc the page, owns this detached freelist * CPU owning page can do sync free operation on this freelist. * SLUB is already highly biased to keep objects on same CPU 2. Bulk alloc without disabling IRQ (SLUB) * This is something Real-Time (RT) people will be screaming for, once more users of bulk API starts to appear. * I think it is doable, but also very challenging to keep performance 3. Faster memset clearing of memory in SLUB * Currently netstack clears SKBs right after alloc (2-3% in perf) * In SLUB allocator we could clear larger section of memory which is significantly faster. * Bulk alloc would be the right spot * Difficult part is inventing an algorithm for matching contiguous mem, which is fast-enough, as the est. time budget is 15-20 cycles. 4. Bulk free from RCU context * One major slowdown of using RCU free is, that free will always hit SLUB slowpath. We could change this via bulk free API. * This would be a major benefit for the entire kernel performance. * The challenge here is getting to know the RCU free code well-enough -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat Author of http://www.iptv-analyzer.org LinkedIn: http://www.linkedin.com/in/brouer -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>