|From:||Ravikiran G Thirumalai <firstname.lastname@example.org>|
|To:||Andrew Morton <email@example.com>|
|Subject:||[patch 0/11] mm: Reimplementation of dynamic per-cpu allocator|
|Date:||Tue, 13 Sep 2005 08:51:12 -0700|
|Cc:||firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, Rusty Russell <firstname.lastname@example.org>|
I have been maintaining a set of patches based on the reimplemented dynamic per-cpu allocator. I would like to have them included in -mm for testing and maybe merged when the mainline merge window opens :)... The reimplementation of the dynamic per-cpu allocator has been published earlier and discussed, But the re-implementation with the applications and supporting numbers weren't published earlier. Here is an attempt towards the same. This patchset contains a) Reimplementation of alloc_percpu. b) Rusty's implementation of distributed reference counters (bigrefs) c) Code to change struct netdevice.refcnt to bigrefs -- this patch improves tbench performance by 6% on a 8 way 3.00 GHZ x86 Intel xeon (x445). d) Code to change struct dst_entry.__refcnt per-cpu. This patch was originally submitted sometime back by Christoph. The reworked patch uses alloc_percpu, and struct dst_entry does not bloat up now. This patch along with the netdevice ref-counter patch above gives a whopping 55 % improvement on tbench on a 8way x86 xeon (x445). The same patchset resulted in 30% better tbench throughput on a x460 (8 way 3.3 Ghz x86_64 xeon). All tbench numbers were on loopback with 8 clients. The patches consist of 1. vmalloc_fixup (Fix up __get_vm_area to take gfp flags as extra arg -- preparatory for 3.) 2. alloc_percpu (Main allocator) 3. alloc_percpu_atomic (Add GFP_FLAGS args to alloc_percpu -- for dst_entry.refcount) 4.change_alloc_percpu_users (Change alloc_percpu users to use modified interface (with gfp_flags)) 5. add_getcpuptr (This is needed for bigrefs) 6. bigrefs (Fixed up bigref from rusty) 7. netdev_refcnt_bigref.patch (Bigref based netdev refcount) 8. dst_abstraction 9. dst_alloc_percpu (dst_entry.refcount patches) 10. allow_early_mapvmarea 11. hotplug_alloc_percpu_blocks (If alloc_percpu needs to be used real early then these patches will be needed. This patch allows us to use bigrefs/alloc_percpu for refcounters like struct vfsmount.mnt_count) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to email@example.com More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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