Date: Tue, 28 May 2013 16:17:19 -0600 From: Zbigniew Bodek <zbb@semihalf.com> To: <freebsd-arm@freebsd.org> Cc: Aleksandr Rybalko <ray@freebsd.org>, Alan Cox <alc@cs.rice.edu> Subject: =?UTF-8?Q?pmap=5Fcopy=20for=20ARMv=36/v=37?= Message-ID: <eb88997fc774ddc47ca0b44e3ef2dbd8@smtp.semihalf.com>
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--=_19aa6322d7875fcf9bb1e310a4996ca6 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="UTF-8" Hello Everyone, I would like to share with you the patch adding pmap_copy() functionality to pmap-v6.c. This is the last but not least of the pmap improvements done as a part of Semihalf work on Superpages support. We tried various technics to test the patch on our target. Apart from obvious long term stability tests and others, we used a simple benchmark to measure fork system call time and overhead. The program can be downloaded from here: http://berlin.ccc.de/~packet/fork_test.c A single fork time has increased as suspected (the program is not measuring a real-life fork situation where child process is actually doing something) but the average system overhead has decreased. For 10000 fork(), 10000 vfork() and 10000 pthread_create() calls we observe 100000 less vm_faults and shorter overall test time. If you have any suggestions or have an idea for benchmarking this feature please share. We will appreciate if you could test this patch on your ARM platforms and send us your review/feedback. Best regards Zbyszek Bodek --=_19aa6322d7875fcf9bb1e310a4996ca6 Content-Transfer-Encoding: base64 Content-Type: text/x-patch; charset="UTF-8"; name="0006-arm-Implement-pmap_copy-for-ARMv6-v7.patch"; Content-Disposition: attachment; filename="0006-arm-Implement-pmap_copy-for-ARMv6-v7.patch"; RnJvbSAyZjI3NWRmYWExYzk5NmZmOGY1NmU2ZGVkMzBhMmUzNzBhZTZmZDk2IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBaYmlnbmlldyBCb2RlayA8emJiQHNlbWloYWxmLmNvbT4KRGF0 ZTogVGh1LCAyMyBNYXkgMjAxMyAxMjo0MDo1NyArMDIwMApTdWJqZWN0OiBbUEFUQ0hdIGFybTog SW1wbGVtZW50IHBtYXBfY29weSgpIGZvciBBUk12Ni92Ny4KCkNvcHkgdGhlIGdpdmVuIHJhbmdl IG9mIG1hcHBpbmdzIGZyb20gdGhlIHNvdXJjZSBtYXAgdG8gdGhlCmRlc3RpbmF0aW9uIG1hcCwg dGhlcmVieSByZWR1Y2luZyB0aGUgbnVtYmVyIG9mIFZNIGZhdWx0cyBvbiBmb3JrLgotLS0KIHN5 cy9hcm0vYXJtL3BtYXAtdjYuYyB8IDEyMCArKysrKysrKysrKysrKysrKysrKysrKysrKysrKysr KysrKysrKysrKysrKysrKysrKwogMSBmaWxlIGNoYW5nZWQsIDEyMCBpbnNlcnRpb25zKCspCgpk aWZmIC0tZ2l0IGEvc3lzL2FybS9hcm0vcG1hcC12Ni5jIGIvc3lzL2FybS9hcm0vcG1hcC12Ni5j 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