diff mbox series

[v16,5/9] tb-stats: reset the tracked TBs on a tb_flush

Message ID 20230628120430.73777-6-fei2.wu@intel.com
State New
Headers show
Series None | expand

Commit Message

Fei Wu June 28, 2023, 12:04 p.m. UTC 
From: Alex Bennée <alex.bennee@linaro.org>

We keep track of translations but can only do so up until the
translation cache is flushed. At that point we really have no idea if
we can re-create a translation because all the active tracking
information has been reset.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Fei Wu <fei2.wu@intel.com>
---
 accel/tcg/tb-maint.c    |  1 +
 accel/tcg/tb-stats.c    | 18 ++++++++++++++++++
 include/exec/tb-stats.h |  8 ++++++++
 3 files changed, 27 insertions(+)
diff mbox series

Patch

diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
index 264bdd84b3..1ebe6fc60e 100644
--- a/accel/tcg/tb-maint.c
+++ b/accel/tcg/tb-maint.c
@@ -762,6 +762,7 @@  static void do_tb_flush(CPUState *cpu, run_on_cpu_data tb_flush_count)
     qht_reset_size(&tb_ctx.htable, CODE_GEN_HTABLE_SIZE);
     tb_remove_all();
 
+    tbstats_reset_tbs();
     tcg_region_reset_all();
     /* XXX: flush processor icache at this point if cache flush is expensive */
     qatomic_inc(&tb_ctx.tb_flush_count);
diff --git a/accel/tcg/tb-stats.c b/accel/tcg/tb-stats.c
index c90dde37d0..7c7f700c89 100644
--- a/accel/tcg/tb-stats.c
+++ b/accel/tcg/tb-stats.c
@@ -103,6 +103,24 @@  void clean_tbstats(void)
     qht_destroy(&tb_ctx.tb_stats);
 }
 
+/*
+ * We have to reset the tbs array on a tb_flush as those
+ * TranslationBlocks no longer exist.
+ */
+
+static void reset_tbs_array(void *p, uint32_t hash, void *userp)
+{
+    TBStatistics *tbs = p;
+    g_ptr_array_set_size(tbs->tbs, 0);
+}
+
+void tbstats_reset_tbs(void)
+{
+    if (tb_ctx.tb_stats.map) {
+        qht_iter(&tb_ctx.tb_stats, reset_tbs_array, NULL);
+    }
+}
+
 void init_tb_stats_htable(void)
 {
     if (!tb_ctx.tb_stats.map && tb_stats_collection_enabled()) {
diff --git a/include/exec/tb-stats.h b/include/exec/tb-stats.h
index ef6e8b6388..cef177bc69 100644
--- a/include/exec/tb-stats.h
+++ b/include/exec/tb-stats.h
@@ -94,4 +94,12 @@  void dump_jit_profile_info(GString *buf);
 
 void clean_tbstats(void);
 
+/**
+ * tbstats_reset_tbs: reset the linked array of TBs
+ *
+ * Reset the list of tbs for a given array. Should be called from
+ * safe work during tb_flush.
+ */
+void tbstats_reset_tbs(void);
+
 #endif