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ircd::allocator: Add msync(2) wrapping.

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This commit is contained in:
Jason Volk 2022-01-26 11:11:25 -08:00
parent 13052f7090
commit 73cd22c7d0
3 changed files with 43 additions and 0 deletions
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1
configure.ac
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@ -1188,6 +1188,7 @@ AC_CHECK_FUNCS([ \
mlock \
mlock2 \
mmap \
msync \
posix_fadvise \
posix_madvise \
preadv2 \

2
include/ircd/allocator.h
View file

@ -50,6 +50,8 @@ namespace ircd::allocator
size_t advise(const const_buffer &, const int &);
size_t prefetch(const const_buffer &);
size_t evict(const const_buffer &);
size_t flush(const const_buffer &, const bool invd = false);
size_t sync(const const_buffer &, const bool invd = false);
void protect(const const_buffer &, const bool = true);
void readonly(const mutable_buffer &, const bool = true);

40
ircd/allocator.cc
View file

@ -165,6 +165,46 @@ ircd::allocator::protect(const const_buffer &buf,
sys::call(::mprotect, ptr, size(buf), prot);
}
size_t
ircd::allocator::sync(const const_buffer &buf,
const bool invd)
{
assert(aligned(data(buf), info::page_size));
const prof::syscall_usage_warning message
{
"msync(2) MS_SYNC MS_INVALIDATE:%b", invd
};
#if defined(HAVE_MSYNC)
int flags {MS_SYNC};
flags |= invd? MS_INVALIDATE: 0;
sys::call(::msync, mutable_cast(data(buf)), size(buf), flags);
return size(buf);
#else
return 0;
#endif
}
size_t
ircd::allocator::flush(const const_buffer &buf,
const bool invd)
{
assert(aligned(data(buf), info::page_size));
const prof::syscall_usage_warning message
{
"msync(2) MS_ASYNC MS_INVALIDATE:%b", invd
};
#if defined(HAVE_MSYNC)
int flags {MS_ASYNC};
flags |= invd? MS_INVALIDATE: 0;
sys::call(::msync, mutable_cast(data(buf)), size(buf), flags);
return size(buf);
#else
return 0;
#endif
}
size_t
ircd::allocator::evict(const const_buffer &buf)
{