From: David Hildenbrand <david@redhat.com>
To: qemu-devel@nongnu.org
Cc: "Pankaj Gupta" <pankaj.gupta.linux@gmail.com>,
"Daniel P . Berrangé" <berrange@redhat.com>,
"Eduardo Habkost" <ehabkost@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
"David Hildenbrand" <david@redhat.com>,
"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
"Pankaj Gupta" <pankaj.gupta@ionos.com>,
"Igor Mammedov" <imammedo@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>
Subject: [PATCH v4 5/7] util/oslib-posix: Avoid creating a single thread with MADV_POPULATE_WRITE
Date: Mon, 4 Oct 2021 14:02:06 +0200 [thread overview]
Message-ID: <20211004120208.7409-6-david@redhat.com> (raw)
In-Reply-To: <20211004120208.7409-1-david@redhat.com>
Let's simplify the case when we only want a single thread and don't have
to mess with signal handlers.
Reviewed-by: Pankaj Gupta <pankaj.gupta@ionos.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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 67c08a425e..efa4f96d56 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -564,6 +564,14 @@ static int 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 -errno;
+ }
+ return 0;
+ }
touch_fn = do_madv_populate_write_pages;
} else {
touch_fn = do_touch_pages;
--
2.31.1
next prev parent reply other threads:[~2021-10-04 12:14 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-04 12:02 [PATCH v4 0/7] util/oslib-posix: Support MADV_POPULATE_WRITE for os_mem_prealloc() David Hildenbrand
2021-10-04 12:02 ` [PATCH v4 1/7] util/oslib-posix: Let touch_all_pages() return an error David Hildenbrand
2021-10-04 12:02 ` [PATCH v4 2/7] util/oslib-posix: Support MADV_POPULATE_WRITE for os_mem_prealloc() David Hildenbrand
2021-10-04 12:02 ` [PATCH v4 3/7] util/oslib-posix: Introduce and use MemsetContext for touch_all_pages() David Hildenbrand
2021-10-07 10:05 ` Dr. David Alan Gilbert
2021-10-07 10:12 ` David Hildenbrand
2021-10-04 12:02 ` [PATCH v4 4/7] util/oslib-posix: Don't create too many threads with small memory or little pages David Hildenbrand
2021-10-04 12:02 ` David Hildenbrand [this message]
2021-10-04 12:02 ` [PATCH v4 6/7] util/oslib-posix: Support concurrent os_mem_prealloc() invocation David Hildenbrand
2021-10-04 12:02 ` [PATCH v4 7/7] util/oslib-posix: Forward SIGBUS to MCE handler under Linux David Hildenbrand
2021-10-11 16:46 ` [PATCH v4 0/7] util/oslib-posix: Support MADV_POPULATE_WRITE for os_mem_prealloc() David Hildenbrand
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