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tcg: move tb_ctx.tb_phys_invalidate_count to tcg_ctx

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Thereby making it per-TCGContext. Once we remove tb_lock, this will
avoid an atomic increment every time a TB is invalidated.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Emilio G. Cota 2017-08-01 15:11:12 -04:00 committed by Richard Henderson
parent be2cdc5e35
commit 128ed2278c
4 changed files with 20 additions and 3 deletions
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5
accel/tcg/translate-all.c
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@ -1069,7 +1069,8 @@ void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr)
/* suppress any remaining jumps to this TB */
tb_jmp_unlink(tb);
tb_ctx.tb_phys_invalidate_count++;
atomic_set(&tcg_ctx->tb_phys_invalidate_count,
tcg_ctx->tb_phys_invalidate_count + 1);
}
#ifdef CONFIG_SOFTMMU
@ -1855,7 +1856,7 @@ void dump_exec_info(FILE *f, fprintf_function cpu_fprintf)
cpu_fprintf(f, "\nStatistics:\n");
cpu_fprintf(f, "TB flush count %u\n",
atomic_read(&tb_ctx.tb_flush_count));
cpu_fprintf(f, "TB invalidate count %d\n", tb_ctx.tb_phys_invalidate_count);
cpu_fprintf(f, "TB invalidate count %zu\n", tcg_tb_phys_invalidate_count());
cpu_fprintf(f, "TLB flush count %zu\n", tlb_flush_count());
tcg_dump_info(f, cpu_fprintf);
}

1
include/exec/tb-context.h
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@ -37,7 +37,6 @@ struct TBContext {
/* statistics */
unsigned tb_flush_count;
int tb_phys_invalidate_count;
};
extern TBContext tb_ctx;

14
tcg/tcg.c
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@ -791,6 +791,20 @@ size_t tcg_code_capacity(void)
return capacity;
}
size_t tcg_tb_phys_invalidate_count(void)
{
unsigned int n_ctxs = atomic_read(&n_tcg_ctxs);
unsigned int i;
size_t total = 0;
for (i = 0; i < n_ctxs; i++) {
const TCGContext *s = atomic_read(&tcg_ctxs[i]);
total += atomic_read(&s->tb_phys_invalidate_count);
}
return total;
}
/* pool based memory allocation */
void *tcg_malloc_internal(TCGContext *s, int size)
{

3
tcg/tcg.h
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@ -695,6 +695,8 @@ struct TCGContext {
/* Threshold to flush the translated code buffer. */
void *code_gen_highwater;
size_t tb_phys_invalidate_count;
/* Track which vCPU triggers events */
CPUState *cpu; /* *_trans */
@ -868,6 +870,7 @@ size_t tcg_code_capacity(void);
void tcg_tb_insert(TranslationBlock *tb);
void tcg_tb_remove(TranslationBlock *tb);
size_t tcg_tb_phys_invalidate_count(void);
TranslationBlock *tcg_tb_lookup(uintptr_t tc_ptr);
void tcg_tb_foreach(GTraverseFunc func, gpointer user_data);
size_t tcg_nb_tbs(void);