add kmem_map_free sysctl: query largest contiguous free range in kmem_map
Suggested by: alc Reviewed by: alc MFC after: 1 week
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0f74b3f3ed
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95bb9d38b8
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=213651
@ -207,6 +207,11 @@ SYSCTL_PROC(_vm, OID_AUTO, kmem_map_size,
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CTLFLAG_RD | CTLTYPE_ULONG | CTLFLAG_MPSAFE, NULL, 0,
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sysctl_kmem_map_size, "LU", "Current kmem_map allocation size");
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static int sysctl_kmem_map_free(SYSCTL_HANDLER_ARGS);
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SYSCTL_PROC(_vm, OID_AUTO, kmem_map_free,
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CTLFLAG_RD | CTLTYPE_ULONG | CTLFLAG_MPSAFE, NULL, 0,
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sysctl_kmem_map_free, "LU", "Largest contiguous free range in kmem_map");
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/*
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* The malloc_mtx protects the kmemstatistics linked list.
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*/
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@ -254,6 +259,18 @@ sysctl_kmem_map_size(SYSCTL_HANDLER_ARGS)
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return (sysctl_handle_long(oidp, &size, 0, req));
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}
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static int
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sysctl_kmem_map_free(SYSCTL_HANDLER_ARGS)
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{
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u_long size;
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vm_map_lock_read(kmem_map);
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size = kmem_map->root != NULL ?
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kmem_map->root->max_free : kmem_map->size;
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vm_map_unlock_read(kmem_map);
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return (sysctl_handle_long(oidp, &size, 0, req));
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}
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/*
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* malloc(9) uma zone separation -- sub-page buffer overruns in one
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* malloc type will affect only a subset of other malloc types.
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