File 0036-AIO-Reduce-number-of-threads-for-32.patch of Package qemu

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File 0036-AIO-Reduce-number-of-threads-for-32.patch of Package qemu (Revision 91263b39712854a2117653428f0b1f66)

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From 6849a7c84a7f2639b0c72ddc6581ff9d4a1c23f7 Mon Sep 17 00:00:00 2001
From: Alexander Graf <agraf@suse.de>
Date: Wed, 14 Jan 2015 01:32:11 +0100
Subject: [PATCH] AIO: Reduce number of threads for 32bit hosts

On hosts with limited virtual address space (32bit pointers), we can very
easily run out of virtual memory with big thread pools.

Instead, we should limit ourselves to small pools to keep memory footprint
low on those systems.

This patch fixes random VM stalls like

(process:25114): GLib-ERROR **: gmem.c:103: failed to allocate 1048576 bytes

on 32bit ARM systems for me.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 thread-pool.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/thread-pool.c b/thread-pool.c
index 402c778..3d06c69 100644
--- a/thread-pool.c
+++ b/thread-pool.c
@@ -297,7 +297,12 @@ static void thread_pool_init_one(ThreadPool *pool, AioContext *ctx)
     qemu_mutex_init(&pool->lock);
     qemu_cond_init(&pool->worker_stopped);
     qemu_sem_init(&pool->sem, 0);
-    pool->max_threads = 64;
+    if (sizeof(pool) == 4) {
+        /* 32bit systems run out of virtual memory quickly */
+        pool->max_threads = 4;
+    } else {
+        pool->max_threads = 64;
+    }
     pool->new_thread_bh = aio_bh_new(ctx, spawn_thread_bh_fn, pool);
 
     QLIST_INIT(&pool->head);

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File 0036-AIO-Reduce-number-of-threads-for-32.patch of Package qemu (Revision 91263b39712854a2117653428f0b1f66)

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