[Qemu-devel] [PATCH for-4.0 11/11] qemu_thread: supplement error handling for touch_all_pages

[Fei Li]

From: Fei Li <address@hidden>

Supplement the error handling for touch_all_pages: add an Error
parameter for it to propagate the error to its caller to do the
handling in case it fails.

Cc: Markus Armbruster <address@hidden>
Signed-off-by: Fei Li <address@hidden>
---
 util/oslib-posix.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index b6c2ee270d..b4dd3d8970 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -435,7 +435,7 @@ static inline int get_memset_num_threads(int smp_cpus)
 }
 
 static bool touch_all_pages(char *area, size_t hpagesize, size_t numpages,
-                            int smp_cpus)
+                            int smp_cpus, Error **errp)
 {
     size_t numpages_per_thread;
     size_t size_per_thread;
@@ -452,20 +452,29 @@ static bool touch_all_pages(char *area, size_t hpagesize, 
size_t numpages,
         memset_thread[i].numpages = (i == (memset_num_threads - 1)) ?
                                     numpages : numpages_per_thread;
         memset_thread[i].hpagesize = hpagesize;
-        /* TODO: let the callers handle the error instead of abort() here */
-        qemu_thread_create(&memset_thread[i].pgthread, "touch_pages",
-                           do_touch_pages, &memset_thread[i],
-                           QEMU_THREAD_JOINABLE, &error_abort);
+        if (qemu_thread_create(&memset_thread[i].pgthread, "touch_pages",
+                               do_touch_pages, &memset_thread[i],
+                               QEMU_THREAD_JOINABLE, errp) < 0) {
+            memset_thread_failed = true;
+            break;
+        }
         addr += size_per_thread;
         numpages -= numpages_per_thread;
     }
+
+    memset_num_threads = i;
     for (i = 0; i < memset_num_threads; i++) {
         qemu_thread_join(&memset_thread[i].pgthread);
     }
     g_free(memset_thread);
     memset_thread = NULL;
 
-    return memset_thread_failed;
+    if (memset_thread_failed) {
+        error_append_hint(errp, "os_mem_prealloc: Insufficient free host "
+                          "memory pages available to allocate guest RAM");
+        return false;
+    }
+    return true;
 }
 
 void os_mem_prealloc(int fd, char *area, size_t memory, int smp_cpus,
@@ -488,10 +497,7 @@ void os_mem_prealloc(int fd, char *area, size_t memory, 
int smp_cpus,
     }
 
     /* touch pages simultaneously */
-    if (touch_all_pages(area, hpagesize, numpages, smp_cpus)) {
-        error_setg(errp, "os_mem_prealloc: Insufficient free host memory "
-            "pages available to allocate guest RAM");
-    }
+    touch_all_pages(area, hpagesize, numpages, smp_cpus, errp);
 
     ret = sigaction(SIGBUS, &oldact, NULL);
     if (ret) {
-- 
2.17.2 (Apple Git-113)