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[PATCH] s390: deadlock in appldata

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The system might hang when using appldata_mem with high I/O traffic and a
large number of devices.  The spinlocks bdev_lock and swaplock are acquired
via calls to si_meminfo() and si_swapinfo() from a tasklet, i.e.  interrupt
context, which can lead to a deadlock.  Replace tasklet with work queue.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Gerald Schaefer
2005-06-04 15:43:33 -07:00
committed by Linus Torvalds
parent 595bf2aaca
commit f26d583e41
4 changed files with 45 additions and 35 deletions
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4
arch/s390/appldata/appldata_os.c
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@@ -49,7 +49,7 @@ struct appldata_os_per_cpu {
u32 per_cpu_softirq; /* ... spent in softirqs */
u32 per_cpu_iowait; /* ... spent while waiting for I/O */
// <-- New in 2.6
};
} __attribute__((packed));
struct appldata_os_data {
u64 timestamp;
@@ -75,7 +75,7 @@ struct appldata_os_data {
/* per cpu data */
struct appldata_os_per_cpu os_cpu[0];
};
} __attribute__((packed));
static struct appldata_os_data *appldata_os_data;