Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 15 Nov 2002 03:01:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 15 Nov 2002 03:01:14 -0500 Received: from packet.digeo.com ([12.110.80.53]:49393 "EHLO packet.digeo.com") by vger.kernel.org with ESMTP id ; Fri, 15 Nov 2002 03:01:10 -0500 Message-ID: <3DD4AB5D.C0EB0F1B@digeo.com> Date: Fri, 15 Nov 2002 00:07:57 -0800 From: Andrew Morton X-Mailer: Mozilla 4.79 [en] (X11; U; Linux 2.5.46 i686) X-Accept-Language: en MIME-Version: 1.0 To: lkml , linux-mm@kvack.org Subject: 2.5.47-mm3 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 15 Nov 2002 08:07:58.0536 (UTC) FILETIME=[1C1F0C80:01C28C7E] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6610 Lines: 269 url: http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.47/2.5.47-mm3/ . A new kgdb stub from George Anzinger. It is significantly stronger than the old one, especially on SMP systems. There are some notes from George in the patch itself, as well as numerous documentation files. You'll need to disable the serial 16550 driver in kernel config - it doesn't play right. (Make sure you read George's notes!) . An updated rbtree-scheduler patch from Jens. This seems to be working well now. The huge queues which we've been experimenting with have continued to pull the VM's pants down, and the last vestiges of the 2.4 page allocator throttling had to go. The page allocator will now never throttle a process by making it wait on IO completion against a particular page or buffer. This has always caused high latencies, and with the big queues, it could cause ninety second latencies for the allocation of a single page. The page allocator will now never throttle a process (except for the caller of write(2)) by making it sleep on request queues. This is fundamentally unmanageable because not only can the size of the queue vary by a lot, but there can be a lot of queues in the machine. So kill it. . The busy-wait failure which occurred when more than 40% of memory was placed under writeout has been fixed. . The ->vm_writeback address_space_operation has been removed. The idea behind this was to allow the filesystem to perform writearound around the particular page. But it had a couple of problems (described in the patch body). So it has been removed, and we're back to page-at-a-time writepage calls in page reclaim. . As a consequence of going back to writepage in the VM, it is no longer compulsory that dirty pages be on the address_space's ->dirty_pages list. So the AIO-for-direct-io patch can now dirty pages from interrupt context. So the patches which made the mapping->page_lock and mapping->private_lock irq-safe have been dropped. . The removal of the last wait_on_page_writeback() in page reclaim has significantly reduced system latency under heavy swapout loads. . The big queues have somewhat worsened throughput with swapstormy tests. Having such large amounts of physical memory under writeout for such long periods gives the VM much less memory to play with at any point in time. Needs work. I suspect the queues are just too darn big for desktop-class machines. We do not intend to leave them this large. . Several tweaks here to increase the efficiency of page reclaim. Under really heavy benchmarky loads the VM is now reclaiming 25% of scanned pages, rather than 10%. Which sounds bad, but actually isn't. Most of this gain came from interrupt-time motion of written-back pages. When IO completes, if the page appears to still be reclaimable, move it to the tail of the inactive list for immediate reclaim. . And a hugetlbpage update. Changes since 2.5.47-mm2: -timers-net.patch Merged -kgdb.patch Out with the old +kgdb-ga.patch In with the new +kgdb-reboot.patch Remote reboot via kgdb -bttv-timer.patch Merged into `misc' -irq-save-vm-locks.patch -irq-safe-private-lock.patch No longer needed. +misc.patch Misc. +htlb-combined-2.patch Bill's stuff +htlb-fixes.patch Rohit's stuff +slab-no-BUG.patch Replace some gratuitous BUGs in slab with useful messages +congestion-wait.patch Fix the big-queue busy-wait problem. +back-to-writepage.patch Remove vm_writeback, use writepage. -swapcache-throttle.patch wait_on_page() is a disaster. +simplified-vm-throttling.patch Always throttle via blk_congestion_wait(). It is a low-latency and controllable way of slowing page allocators to the rate at which the IO system can retire writes. +page-reclaim-motion.patch Move reclaimable pages at interrupt-time. +handle-fail-writepage.patch Handle unwriteable pages at the VM level. +activate-unreleaseable-pages.patch Move pinned-via-buffers pages onto the active list. All patches: linus.patch cset-1.823-to-1.856.txt.gz kgdb-ga.patch kgdb stub for ia32 (George Anzinger's one) kgdb-reboot.patch ADd a `reboot' command to kgdb rcu-stats.patch RCU statistics reporting genksyms-fix.patch modversions fix for exporting per-cpu data buffer-debug.patch buffer.c debugging mbcache-cleanup.patch mbcache: add gfp_mask parameter to free() callback, cleanups rmap-flush-cache-page.patch flush_cache_page while pte valid swap-get_page-page-unlock.patch unlock_page when get_swap_bio fails swap-writepages-swizzled.patch Subject: [PATCH] swap writepages swizzled misc.patch timer fixes htlb-combined-2.patch hugetlb cleanups htlb-fixes.patch more hugetlb fixes slab-no-BUG.patch improved slab error diagnostics congestion-wait.patch Fix busy-wait with writeback to large queues back-to-writepage.patch Remove mapping->vm_writeback aio-direct-io-infrastructure.patch AIO support for raw/O_DIRECT aio-direct-io.patch AIO support for raw/O_DIRECT inlines-net.patch reiserfs-readpages.patch reiserfs v3 readpages support reiserfs-readpages-fix.patch remove-inode-buffers.patch try to remove buffer_heads from to-be-reaped inodes resurrect-incremental-min.patch strengthen the `incremental min' logic in the page allocator unfreeable-zones.patch VM: handle zones which are full of unreclaimable pages mpage-kmap.patch kmap->kmap_atomic in mpage.c nobh.patch no-buffer-head ext2 option inode-reclaim-balancing.patch better inode reclaim balancing simplified-vm-throttling.patch Remove the final per-page throttling site in the VM auto-unplug.patch self-unplugging request queues less-unplugging.patch Remove most of the blk_run_queues() calls page-reclaim-motion.patch Move reclaimable pages to the tail ofthe inactive list on IO completion handle-fail-writepage.patch Special-case fail_writepage() in page reclaim activate-unreleaseable-pages.patch Move unreleasable pages onto the active list rbtree-iosched.patch rbtree-based IO scheduler page-reservation.patch Page reservation API wli-show_free_areas.patch show_free_areas extensions kmap-atomic-nfs.patch Subject: Re: [RFC] use kmap_atomic in the NFS client dcache_rcu.patch Use RCU for dcache shpte-ng.patch pagetable sharing for ia32 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/