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The memory area in each slot should be aligned to host page size.
Otherwise, the test will fail. For example, the following command
fails with the following messages with 64KB-page-size-host and
4KB-pae-size-guest. It's not user friendly to abort the test.
Lets do something to report the optimal memory slots, instead of
failing the test.
# ./memslot_perf_test -v -s 1000
Number of memory slots: 999
Testing map performance with 1 runs, 5 seconds each
Adding slots 1..999, each slot with 8 pages + 216 extra pages last
==== Test Assertion Failure ====
lib/kvm_util.c:824: vm_adjust_num_guest_pages(vm->mode, npages) == npages
pid=19872 tid=19872 errno=0 - Success
1 0x00000000004065b3: vm_userspace_mem_region_add at kvm_util.c:822
2 0x0000000000401d6b: prepare_vm at memslot_perf_test.c:273
3 (inlined by) test_execute at memslot_perf_test.c:756
4 (inlined by) test_loop at memslot_perf_test.c:994
5 (inlined by) main at memslot_perf_test.c:1073
6 0x0000ffff7ebb4383: ?? ??:0
7 0x00000000004021ff: _start at :?
Number of guest pages is not compatible with the host. Try npages=16
Report the optimal memory slots instead of failing the test when
the memory area in each slot isn't aligned to host page size. With
this applied, the optimal memory slots is reported.
# ./memslot_perf_test -v -s 1000
Number of memory slots: 999
Testing map performance with 1 runs, 5 seconds each
Memslot count too high for this test, decrease the cap (max is 514)
Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221020071209.559062-7-gshan@redhat.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.