[CRIU] [PATCH v2] Use run-time page size where it matters

[Cyrill Gorcunov]

On Mon, Apr 20, 2015 at 11:09:20AM -0400, Christopher Covington wrote:
> In AArch64, pages may be 4K or 64K depending on kernel configuration.
> The GNU C Library documentation suggests [1], "the correct interface
> to query about the page size is sysconf". Introduce one new
> architecture-specific function-like macro, page_size(), that on x86
> and AArch32 remains a constant so as to minimally affect performance,
> but on AArch64 is sysconf(_SC_PAGESIZE) for correctness.
> 
> 1. https://www.gnu.org/software/libc/manual/html_node/Query-Memory-Parameters.html
> 
> To minimize churn, the PAGE_SIZE macro is left as a build-time
> estimation of what the run-time page size might be.
> 
> This fixes the following errors for CRIU on AArch64 kernels with
> CONFIG_ARM64_64K_PAGES=y, allowing dump of
> `setsid sleep < /dev/null &> /dev/null` to succeed.
> 
> Error (kerndat.c:48): Can't stat self map_files: No such file or directory
> 
> Error (util.c:668): Can't read pme for pid 90: No such file or directory
> 
> Error (parasite-syscall.c:1135): Can't open 89/map_files/0x3ffb7da0000-0x3ffb7dac000 on procfs: No such file or directory
> 
> Signed-off-by: Christopher Covington <cov at codeaurora.org>

Acked-by: Cyrill Gorcunov <gorcunov at openvz.org>

Thank you!