On Thu, 24 Mar 2011, amir73il@xxxxxxxxxxxxxxxxxxxxx wrote: > The purpose of this patch set is the removal of grp->alloc_sem locks > from block allocation paths. > > The resulting code is cleaner and should perform better in concurrent > allocating tasks workloads. Hi Amir, Do you have any performance numbers indicating performance improvement in concurrent allocations ? The only point where I can see taking write semaphore is in filesystem resize code. Or am I missing something ? Thanks! -Lukas > > I ran several xfstests runs with these patches (4K and 1K block size). > I tried several online resizes and verifyed that both in-core and on-disk > group counters are correct. > > v2->v1: > - fix silly bug in patch 4/5 that triggers BUG_ON(incore == NULL) > - replace get_undo_access() with get_write_access() > - ran xfstests with block size 1K (where 2 groups share a buddy page) > > [PATCH v2 1/5] ext4: move ext4_add_groupblocks() to mballoc.c > [PATCH v2 2/5] ext4: implement ext4_add_groupblocks() by freeing blocks > [PATCH v2 3/5] ext4: synchronize ext4_mb_init_group() with buddy page lock > [PATCH v2 4/5] ext4: teach ext4_mb_init_cache() to skip uptodate buddy caches > [PATCH v2 5/5] ext4: remove alloc_semp > > -- > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
