Messages in this thread Patch in this message |  | | Date | Tue, 17 Sep 2002 17:43:29 +0200 | From | Roberto Nibali <> | Subject | TLB flush counters gone in 2.5.35-bk? |
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Hello,
I was just browsing over the latest bk tree when I saw the following change:
--- a/include/asm-generic/tlb.h Thu Aug 29 13:27:24 2002 +++ b/include/asm-generic/tlb.h Mon Sep 9 14:58:18 2002 @@ -21,7 +21,7 @@ * and page free order so much.. */ #ifdef CONFIG_SMP - #define FREE_PTE_NR 507 + #define FREE_PTE_NR 506 #define tlb_fast_mode(tlb) ((tlb)->nr == ~0U) #else #define FREE_PTE_NR 1 @@ -40,8 +40,6 @@ unsigned int fullmm; /* non-zero means full mm flush */ unsigned long freed; struct page * pages[FREE_PTE_NR]; - unsigned long flushes;/* stats: count avoided flushes */ - unsigned long avoided_flushes; } mmu_gather_t;
/* Users of the generic TLB shootdown code must declare this storage space. */ @@ -67,17 +65,10 @@
static inline void tlb_flush_mmu(mmu_gather_t *tlb, unsigned long start, unsigned long en d) { - unsigned long nr; - - if (!tlb->need_flush) { - tlb->avoided_flushes++; + if (!tlb->need_flush) return; - } tlb->need_flush = 0; - tlb->flushes++; - tlb_flush(tlb); - nr = tlb->nr; if (!tlb_fast_mode(tlb)) { free_pages_and_swap_cache(tlb->pages, tlb->nr); tlb->nr = 0; Why was that done? I'm actually about to conduct some tests where I think that I need this information to check the L1 <-> L2 caching size influence on kernel data structures. What is the problem with the existing counters, did I miss some discussion on LKML?
Best regards, Roberto Nibali, ratz -- echo '[q]sa[ln0=aln256%Pln256/snlbx]sb3135071790101768542287578439snlbxq'|dc - 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/
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