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ircd::fs: Split and improve fincore().

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This commit is contained in:
Jason Volk 2019-05-03 04:33:48 -07:00
parent 76f8aa6673
commit e75c9fe54c
1 changed files with 24 additions and 5 deletions
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29
ircd/fs.cc
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@ -478,6 +478,7 @@ ircd::fs::flush(const fd &fd,
namespace ircd::fs namespace ircd::fs
{ {
static bool fincore(void *const &map, const size_t &map_size, uint8_t *const &vec, const size_t &vec_size);
static size_t advise(const fd &, const size_t &, const read_opts &, const int &advice); static size_t advise(const fd &, const size_t &, const read_opts &, const int &advice);
} }
@ -545,15 +546,33 @@ ircd::fs::fincore(const fd &fd,
} }
}; };
using word_t = unsigned long long;
thread_local std::array<word_t, 64> tls_vec;
const size_t vec_size const size_t vec_size
{ {
std::max(((map_size + info::page_size - 1) / info::page_size) / 8, 1UL) std::max(((map_size + info::page_size - 1) / info::page_size) / sizeof(word_t), 1UL)
}; };
assert(vec_size > 0 && vec_size < map_size);
std::vector<uint64_t> vec(vec_size); assert(vec_size > 0 && vec_size < map_size);
syscall(::mincore, map, map_size, reinterpret_cast<uint8_t *>(vec.data())); const auto dynamic_vec_size
return std::find(begin(vec), end(vec), 0UL) == end(vec); {
vec_size > tls_vec.size()? vec_size : 0UL
};
std::vector<word_t> dynamic_vec(dynamic_vec_size);
auto *const vec(dynamic_vec_size? dynamic_vec.data(): tls_vec.data());
return fincore(map, map_size, reinterpret_cast<uint8_t *>(vec), vec_size);
}
bool
ircd::fs::fincore(void *const &map,
const size_t &map_size,
uint8_t *const &vec,
const size_t &vec_size)
{
syscall(::mincore, map, map_size, vec);
return std::find(vec, vec + vec_size, 0UL) == vec + vec_size;
} }
std::string std::string