Files
sysprof/src/libsysprof-capture
John David Anglin b129c7dea2 mapped-ring-buffer: Round to the shared memory boundary on hppa
In map_head_and_body_twice(), the second mmap call fails:

mmap2(NULL, 135168, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0) = 0xf64a2000
mmap2(0xf64b3000, 65536, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, 3, 0x1000) = -1 EINVAL (Invalid argument)

Due to cache issues, all shared mapping of a page must be equivalently
mapped.  This requires page mappings to be at the same virtual address
modulo 4 MB.  Due to a kernel limitation, all mappings to a file must
be equivalent.

The test can be fixed by rounding the buffer_size used in the mapped
ring buffer to 4 MB on hppa.  This makes the two mmap mappings equivalent.

Bug-Debian: https://bugs.debian.org/1021853
2025-03-17 11:53:28 -04:00
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