3977e7cae6
Follow up on ideas prompted by last change: clean up the patches generated by git workflow. There is no value to the first line (mbox From line), or [PATCH] on subject line. Get rid of those. Other minor fixes and improvements to update_git.sh OBS-URL: https://build.opensuse.org/request/show/662931 OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=443
40 lines
1.3 KiB
Diff
40 lines
1.3 KiB
Diff
From: Alexander Graf <agraf@suse.de>
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Date: Wed, 14 Jan 2015 01:32:11 +0100
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Subject: AIO: Reduce number of threads for 32bit hosts
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On hosts with limited virtual address space (32bit pointers), we can very
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easily run out of virtual memory with big thread pools.
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Instead, we should limit ourselves to small pools to keep memory footprint
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low on those systems.
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This patch fixes random VM stalls like
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(process:25114): GLib-ERROR **: gmem.c:103: failed to allocate 1048576 bytes
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on 32bit ARM systems for me.
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Signed-off-by: Alexander Graf <agraf@suse.de>
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---
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util/thread-pool.c | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/util/thread-pool.c b/util/thread-pool.c
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index 610646d131..2e34e9846d 100644
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--- a/util/thread-pool.c
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+++ b/util/thread-pool.c
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@@ -308,7 +308,12 @@ static void thread_pool_init_one(ThreadPool *pool, AioContext *ctx)
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qemu_mutex_init(&pool->lock);
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qemu_cond_init(&pool->worker_stopped);
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qemu_sem_init(&pool->sem, 0);
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- pool->max_threads = 64;
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+ if (sizeof(pool) == 4) {
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+ /* 32bit systems run out of virtual memory quickly */
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+ pool->max_threads = 4;
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+ } else {
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+ pool->max_threads = 64;
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+ }
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pool->new_thread_bh = aio_bh_new(ctx, spawn_thread_bh_fn, pool);
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QLIST_INIT(&pool->head);
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