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tcg: Move tb_phys_invalidate_count to tb_ctx
We can call do_tb_phys_invalidate from an iocontext, which has no per-thread tcg_ctx. Move this to tb_ctx, which is global. The actual update still takes place with a lock held, so only an atomic set is required, not an atomic increment. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/457 Tested-by: Viktor Ashirov <vashirov@redhat.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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@ -34,6 +34,7 @@ struct TBContext {
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/* statistics */
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unsigned tb_flush_count;
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unsigned tb_phys_invalidate_count;
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};
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extern TBContext tb_ctx;
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@ -1219,8 +1219,8 @@ static void do_tb_phys_invalidate(TranslationBlock *tb, bool rm_from_page_list)
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/* suppress any remaining jumps to this TB */
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tb_jmp_unlink(tb);
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qatomic_set(&tcg_ctx->tb_phys_invalidate_count,
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tcg_ctx->tb_phys_invalidate_count + 1);
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qatomic_set(&tb_ctx.tb_phys_invalidate_count,
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tb_ctx.tb_phys_invalidate_count + 1);
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}
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static void tb_phys_invalidate__locked(TranslationBlock *tb)
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@ -2128,8 +2128,8 @@ void dump_exec_info(void)
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qemu_printf("\nStatistics:\n");
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qemu_printf("TB flush count %u\n",
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qatomic_read(&tb_ctx.tb_flush_count));
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qemu_printf("TB invalidate count %zu\n",
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tcg_tb_phys_invalidate_count());
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qemu_printf("TB invalidate count %u\n",
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qatomic_read(&tb_ctx.tb_phys_invalidate_count));
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tlb_flush_counts(&flush_full, &flush_part, &flush_elide);
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qemu_printf("TLB full flushes %zu\n", flush_full);
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@ -579,8 +579,6 @@ struct TCGContext {
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/* Threshold to flush the translated code buffer. */
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void *code_gen_highwater;
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size_t tb_phys_invalidate_count;
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/* Track which vCPU triggers events */
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CPUState *cpu; /* *_trans */
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@ -815,7 +813,6 @@ size_t tcg_code_capacity(void);
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void tcg_tb_insert(TranslationBlock *tb);
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void tcg_tb_remove(TranslationBlock *tb);
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size_t tcg_tb_phys_invalidate_count(void);
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TranslationBlock *tcg_tb_lookup(uintptr_t tc_ptr);
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void tcg_tb_foreach(GTraverseFunc func, gpointer user_data);
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size_t tcg_nb_tbs(void);
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14
tcg/region.c
14
tcg/region.c
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@ -980,17 +980,3 @@ size_t tcg_code_capacity(void)
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return capacity;
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}
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size_t tcg_tb_phys_invalidate_count(void)
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{
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unsigned int n_ctxs = qatomic_read(&tcg_cur_ctxs);
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unsigned int i;
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size_t total = 0;
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for (i = 0; i < n_ctxs; i++) {
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const TCGContext *s = qatomic_read(&tcg_ctxs[i]);
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total += qatomic_read(&s->tb_phys_invalidate_count);
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}
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return total;
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}
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