This patchset continues/adapts Minchan Kim's work to remove the x86 dependency from zsmalloc. However, instead of whitelisting archs with support for local_tlb_flush_kernel_range() in the zsmalloc Kconfig, this patchset allows zsmalloc to work with all archs through the addition of a generic/portable page mapping methods (i.e. memcpy) when the required tlb flushing functionality is not supported by the arch. The arch advertises support for local_tlb_flush_kernel_range() by defining __HAVE_LOCAL_FLUSH_TLB_KERNEL_RANGE The third patch in the set adds local_tlb_flush_kernel_range() support to x86. In my single-threaded tests using zcache, using the pte/tlb mapping method was 40% faster than the generic method. So while the third patch is optional, it is highly recommended. Alex Shi is working on a large x86 patchset that includes functionality similar to the third patch, however, it seems that this patchset is getting very little attention and includes much more than is needed for zsmalloc's purposes. https://lkml.org/lkml/2012/6/12/116 Future work: - Add __HAVE_LOCAL_FLUSH_TLB_KERNEL_RANGE definition to archs that already have local_tlb_flush_kernel_range() - Add mapping mode flags (RO, WO, RW) to zs_map_object() to avoid unnecessary copies in the generic case Based on Greg's staging-next. Seth Jennings (3): zram/zcache: swtich Kconfig dependency from X86 to ZSMALLOC zsmalloc: add generic path and remove x86 dependency x86: add local_tlb_flush_kernel_range() arch/x86/include/asm/tlbflush.h | 21 +++++ drivers/staging/zcache/Kconfig | 5 +- drivers/staging/zram/Kconfig | 5 +- drivers/staging/zsmalloc/Kconfig | 4 - drivers/staging/zsmalloc/zsmalloc-main.c | 136 ++++++++++++++++++++++++------ drivers/staging/zsmalloc/zsmalloc_int.h | 5 +- 6 files changed, 138 insertions(+), 38 deletions(-) -- 1.7.9.5 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
