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[PATCH v2 4/6] util/oslib-posix: Avoid creating a single thread with MAD
From: |
David Hildenbrand |
Subject: |
[PATCH v2 4/6] util/oslib-posix: Avoid creating a single thread with MADV_POPULATE_WRITE |
Date: |
Thu, 22 Jul 2021 14:36:33 +0200 |
Let's simplify the case when we only want a single thread and don't have
to mess with signal handlers.
Signed-off-by: David Hildenbrand <david@redhat.com>
---
util/oslib-posix.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index a1d309d495..1483e985c6 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -568,6 +568,14 @@ static bool touch_all_pages(char *area, size_t hpagesize,
size_t numpages,
}
if (use_madv_populate_write) {
+ /* Avoid creating a single thread for MADV_POPULATE_WRITE */
+ if (context.num_threads == 1) {
+ if (qemu_madvise(area, hpagesize * numpages,
+ QEMU_MADV_POPULATE_WRITE)) {
+ return true;
+ }
+ return false;
+ }
touch_fn = do_madv_populate_write_pages;
} else {
touch_fn = do_touch_pages;
--
2.31.1
[PATCH v2 2/6] util/oslib-posix: Introduce and use MemsetContext for touch_all_pages(), David Hildenbrand, 2021/07/22
[PATCH v2 3/6] util/oslib-posix: Don't create too many threads with small memory or little pages, David Hildenbrand, 2021/07/22
[PATCH v2 4/6] util/oslib-posix: Avoid creating a single thread with MADV_POPULATE_WRITE,
David Hildenbrand <=
[PATCH v2 5/6] util/oslib-posix: Support concurrent os_mem_prealloc() invocation, David Hildenbrand, 2021/07/22
[PATCH v2 6/6] util/oslib-posix: Forward SIGBUS to MCE handler under Linux, David Hildenbrand, 2021/07/22