Hello, Current pool shrinking is not page unit, block unit. But shrinker returns the pool size in page unit, so it is confused. And there is no way to control pool size and shrink pool directly. I have 3 patches like followings. 1. Patch 1/3: make pool be shrinked by page unit This patch shrinks pool in page unit. 2. Patch 2/3: limit pool size This patch specifies pool size limit via debugfs. The default value of limit is 0. cat /sys/kernel/debug/ion/heaps/system_limit returns 0. If you want to create 4 pools and limit each pool by 10MB, you can write 40MB(=41943040) at system_limit debugfs file like following: echo 41943040 > /sys/kernel/debug/ion/heaps/system_limit 2. Patch 3/3: enable debugfs to shrink page directly This patch enables debugfs to specify shrink amount. For instance, this shrinks all pages in every pool. echo 0 > /sys/kernel/debug/ion/heaps/system_shrink And this shrinks 300-pages from entire pool. echo 30 > /sys/kernel/debug/ion/heaps/system_shrink It try to shrink high-order pool first because high-order pages is necessary more than low-order when the system has low memory. This patchset is based on linux-next-20141023. Gioh Kim (3): staging: ion: shrink page-pool by page unit staging: ion: limit pool size staging: ion: debugfs to shrink pool drivers/staging/android/ion/ion.c | 62 ++++++++++++++++--------- drivers/staging/android/ion/ion_page_pool.c | 32 ++++++++----- drivers/staging/android/ion/ion_system_heap.c | 20 ++++++-- 3 files changed, 75 insertions(+), 39 deletions(-) -- 1.7.9.5 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
