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Use atomic ops to update amountpipekva. Amountpipekva represents the

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total kernel virtual address space used by all pipes.  It is, thus, outside
the scope of any individual pipe lock.
This commit is contained in:
alc 2003-02-13 19:39:54 +00:00
parent 43e82f74f7
commit d3cfca777c
1 changed files with 8 additions and 5 deletions
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13
sys/kern/sys_pipe.c
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@ -332,7 +332,7 @@ pipespace(cpipe, size)
cpipe->pipe_buffer.in = 0;
cpipe->pipe_buffer.out = 0;
cpipe->pipe_buffer.cnt = 0;
amountpipekva += cpipe->pipe_buffer.size;
atomic_add_int(&amountpipekva, cpipe->pipe_buffer.size);
return (0);
}
@ -676,7 +676,8 @@ pipe_build_write_buffer(wpipe, uio)
*/
wpipe->pipe_map.kva = kmem_alloc_pageable(kernel_map,
wpipe->pipe_buffer.size + PAGE_SIZE);
amountpipekva += wpipe->pipe_buffer.size + PAGE_SIZE;
atomic_add_int(&amountpipekva,
wpipe->pipe_buffer.size + PAGE_SIZE);
}
pmap_qenter(wpipe->pipe_map.kva, wpipe->pipe_map.ms,
wpipe->pipe_map.npages);
@ -714,7 +715,8 @@ pipe_destroy_write_buffer(wpipe)
wpipe->pipe_map.kva = 0;
kmem_free(kernel_map, kva,
wpipe->pipe_buffer.size + PAGE_SIZE);
amountpipekva -= wpipe->pipe_buffer.size + PAGE_SIZE;
atomic_subtract_int(&amountpipekva,
wpipe->pipe_buffer.size + PAGE_SIZE);
}
}
vm_page_lock_queues();
@ -1338,7 +1340,7 @@ pipe_free_kmem(cpipe)
if (cpipe->pipe_buffer.buffer != NULL) {
if (cpipe->pipe_buffer.size > PIPE_SIZE)
--nbigpipe;
amountpipekva -= cpipe->pipe_buffer.size;
atomic_subtract_int(&amountpipekva, cpipe->pipe_buffer.size);
kmem_free(kernel_map,
(vm_offset_t)cpipe->pipe_buffer.buffer,
cpipe->pipe_buffer.size);
@ -1346,7 +1348,8 @@ pipe_free_kmem(cpipe)
}
#ifndef PIPE_NODIRECT
if (cpipe->pipe_map.kva != 0) {
amountpipekva -= cpipe->pipe_buffer.size + PAGE_SIZE;
atomic_subtract_int(&amountpipekva,
cpipe->pipe_buffer.size + PAGE_SIZE);
kmem_free(kernel_map,
cpipe->pipe_map.kva,
cpipe->pipe_buffer.size + PAGE_SIZE);