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ircd::fs: Move madvise suite to allocator unit.

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This commit is contained in:
Jason Volk 2021-05-02 13:21:43 -07:00
parent f0fe13e8e5
commit 5534672a07
3 changed files with 103 additions and 75 deletions
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3
include/ircd/allocator.h
View file

@ -47,6 +47,9 @@ namespace ircd::allocator
bool trim(const size_t &pad = 0) noexcept; // malloc_trim(3)
size_t incore(const const_buffer &);
size_t advise(const const_buffer &, const int &);
size_t prefetch(const const_buffer &);
size_t evict(const const_buffer &);
std::unique_ptr<char, decltype(&std::free)>
aligned_alloc(const size_t &align, const size_t &size);

79
ircd/allocator.cc
View file

@ -24,6 +24,26 @@ namespace ircd::allocator
static void advise_hugepage(void *const &, const size_t &alignment, const size_t &size);
}
#if defined(MADV_NORMAL) && defined(POSIX_MADV_NORMAL)
static_assert(MADV_NORMAL == POSIX_MADV_NORMAL);
#endif
#if defined(MADV_SEQUENTIAL) && defined(POSIX_MADV_SEQUENTIAL)
static_assert(MADV_SEQUENTIAL == POSIX_MADV_SEQUENTIAL);
#endif
#if defined(MADV_RANDOM) && defined(POSIX_MADV_RANDOM)
static_assert(MADV_RANDOM == POSIX_MADV_RANDOM);
#endif
#if defined(MADV_WILLNEED) && defined(POSIX_MADV_WILLNEED)
static_assert(MADV_WILLNEED == POSIX_MADV_WILLNEED);
#endif
#if defined(MADV_DONTNEED) && defined(POSIX_MADV_DONTNEED)
static_assert(MADV_DONTNEED == POSIX_MADV_DONTNEED);
#endif
std::unique_ptr<char, decltype(&std::free)>
ircd::allocator::aligned_alloc(const size_t &alignment_,
const size_t &size_)
@ -115,6 +135,65 @@ catch(const std::exception &e)
}
#endif
size_t
ircd::allocator::evict(const const_buffer &buf)
{
#if defined(POSIX_MADV_DONTNEED)
return advise(buf, POSIX_MADV_DONTNEED);
#else
return 0;
#endif
}
size_t
ircd::allocator::prefetch(const const_buffer &buf)
{
#if defined(POSIX_MADV_WILLNEED)
return advise(buf, POSIX_MADV_WILLNEED);
#else
return 0;
#endif
}
#if defined(HAVE_MADVISE)
size_t
ircd::allocator::advise(const const_buffer &buf,
const int &advice)
{
assert(aligned(data(buf), info::page_size));
switch(const auto r(::madvise(mutable_cast(data(buf)), size(buf), advice)); r)
{
case 0:
return size(buf); // success
default:
throw_system_error(r); // error
}
__builtin_unreachable();
}
#elif defined(HAVE_POSIX_MADVISE)
size_t
ircd::allocator::advise(const const_buffer &buf,
const int &advice)
{
const auto res
{
syscall(::posix_madvise, mutable_cast(data(buf)), size(buf), advice)
};
return size(buf);
}
#else
#warning "posix_madvise(2) not available for this compilation."
size_t
ircd::allocator::advise(const const_buffer &buf,
const int &advice)
{
return 0;
}
#endif
size_t
ircd::allocator::incore(const const_buffer &buf)
{

96
ircd/fs.cc
View file

@ -1941,56 +1941,10 @@ namespace ircd::fs
static uint prot(const map::opts &);
}
#if defined(MADV_NORMAL) && defined(POSIX_MADV_NORMAL)
static_assert(MADV_NORMAL == POSIX_MADV_NORMAL);
#endif
#if defined(MADV_SEQUENTIAL) && defined(POSIX_MADV_SEQUENTIAL)
static_assert(MADV_SEQUENTIAL == POSIX_MADV_SEQUENTIAL);
#endif
#if defined(MADV_RANDOM) && defined(POSIX_MADV_RANDOM)
static_assert(MADV_RANDOM == POSIX_MADV_RANDOM);
#endif
#if defined(MADV_WILLNEED) && defined(POSIX_MADV_WILLNEED)
static_assert(MADV_WILLNEED == POSIX_MADV_WILLNEED);
#endif
#if defined(MADV_DONTNEED) && defined(POSIX_MADV_DONTNEED)
static_assert(MADV_DONTNEED == POSIX_MADV_DONTNEED);
#endif
size_t
ircd::fs::evict(const map &map,
const size_t &len,
const opts &opts)
{
#if defined(POSIX_MADV_DONTNEED)
return advise(map, POSIX_MADV_DONTNEED, len, opts);
#else
return 0;
#endif
}
size_t
ircd::fs::prefetch(const map &map,
const size_t &len,
const opts &opts)
{
#if defined(POSIX_MADV_WILLNEED)
return advise(map, POSIX_MADV_WILLNEED, len, opts);
#else
return 0;
#endif
}
#if defined(HAVE_MADVISE) && defined(__linux__)
size_t
ircd::fs::advise(const map &map,
const int &advice,
const size_t &len,
const opts &opts)
{
const size_t offset
{
@ -2002,19 +1956,27 @@ ircd::fs::advise(const map &map,
map + offset, len
};
assert(aligned(data(buf), info::page_size));
switch(const auto res(::madvise(data(buf), size(buf), advice)); res)
{
case 0:
return size(buf); // success
default:
throw_system_error(res); // error
}
__builtin_unreachable();
return allocator::evict(buf);
}
#elif defined(HAVE_POSIX_MADVISE)
size_t
ircd::fs::prefetch(const map &map,
const size_t &len,
const opts &opts)
{
const size_t offset
{
buffer::align(opts.offset, info::page_size)
};
const mutable_buffer buf
{
map + offset, len
};
return allocator::prefetch(buf);
}
size_t
ircd::fs::advise(const map &map,
const int &advice,
@ -2026,24 +1988,8 @@ ircd::fs::advise(const map &map,
map + opts.offset, len
};
const auto res
{
syscall(::posix_madvise, data(buf), size(buf), advice)
};
return size(buf);
return allocator::advise(buf, advice);
}
#else
#warning "posix_madvise(2) not available for this compilation."
size_t
ircd::fs::advise(const map &map,
const int &advice,
const size_t &len,
const opts &opts)
{
return 0;
}
#endif
//
// map::map