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36c4ead6f6
free_object() adds objects to the pool list and schedules work when the
pool list is larger than the pool size. The worker handles the actual
kfree() of the object by iterating the pool list until the pool size is
below the maximum pool size again.
To iterate the pool list, pool_lock has to be held and the objects which
should be freed() need to be put into temporary storage so pool_lock can be
dropped for the actual kmem_cache_free() invocation. That's a pointless and
expensive exercise if there is a large number of objects to free.
In such a case its better to evaulate the fill level of the pool in
free_objects() and queue the object to free either in the pool list or if
it's full on a separate global free list.
The worker can then do the following simpler operation:
- Move objects back from the global free list to the pool list if the
pool list is not longer full.
- Remove the remaining objects in a single list move operation from the
global free list and do the kmem_cache_free() operation lockless from
the temporary list head.
In fill_pool() the global free list is checked as well to avoid real
allocations from the kmem cache.
Add the necessary list head and a counter for the number of objects on the
global free list and export that counter via sysfs:
max_chain :79
max_loops :8147
warnings :0
fixups :0
pool_free :1697
pool_min_free :346
pool_used :15356
pool_max_used :23933
on_free_list :39
objs_allocated:32617
objs_freed :16588
Nothing queues objects on the global free list yet. This happens in a
follow up change.
[ tglx: Simplified implementation and massaged changelog ]
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: longman@redhat.com
Link: https://lkml.kernel.org/r/1517872708-24207-3-git-send-email-yang.shi@linux.alibaba.com
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.