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buffer: implement buffer::list::reserve(n)

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Make sure we have N bytes of append_buffer reserved. On
a new or cleared list, this allocates exactly that much
runway, allowing us to control memory usage.

Signed-off-by: Sage Weil <sage@redhat.com>
This commit is contained in:
Sage Weil 2016-09-07 16:45:29 -04:00
parent 9cd042a566
commit 9035883c33
1 changed files with 8 additions and 2 deletions
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10
src/include/buffer.h
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@ -387,8 +387,7 @@ namespace buffer CEPH_BUFFER_API {
list() : _len(0), _memcopy_count(0), last_p(this) {}
// cppcheck-suppress noExplicitConstructor
list(unsigned prealloc) : _len(0), _memcopy_count(0), last_p(this) {
append_buffer = buffer::create(prealloc);
append_buffer.set_length(0); // unused, so far.
reserve(prealloc);
}
list(const list& other) : _buffers(other._buffers), _len(other._len),
@ -500,6 +499,13 @@ namespace buffer CEPH_BUFFER_API {
unsigned align_memory);
bool rebuild_page_aligned();
void reserve(size_t prealloc) {
if (append_buffer.unused_tail_length() < prealloc) {
append_buffer = buffer::create(prealloc);
append_buffer.set_length(0); // unused, so far.
}
}
// assignment-op with move semantics
const static unsigned int CLAIM_DEFAULT = 0;
const static unsigned int CLAIM_ALLOW_NONSHAREABLE = 1;