Commit Graph

1509 Commits

Author SHA1 Message Date
David Goldblatt
47d8a7e6b0 psset: Purge empty slabs first.
These are particularly good candidates for purging (listed in the diff).
2021-07-12 17:59:18 -07:00
David Goldblatt
41fd56605e HPA: Purge across retained extents.
This lets us cut down on the number of expensive system calls we perform.
2021-07-12 17:59:18 -07:00
David Goldblatt
347523517b PAI: Fix a typo. 2021-07-12 17:59:11 -07:00
David Goldblatt
de033f56c0 mpsc_queue: Add module.
This is a simple multi-producer, single-consumer queue.  The intended use case
is in the HPA, as we begin supporting hpdatas that move between hpa_shards.  We
take just a single CAS as the cost to send a message (or a batch of messages) in
the low-contention case, and lock-freedom lets us avoid some lock-ordering
issues.
2021-06-24 14:55:49 -07:00
David Goldblatt
4452a4812f Add opt.experimental_infallible_new.
This allows a guarantee that operator new never throws.

Fix the .gitignore rules to include test/integration/cpp while we're here.
2021-06-24 12:22:51 -07:00
David Carlier
4fb93a18ee extent_can_acquire_neighbor typo fix 2021-06-19 08:13:11 -07:00
Vineet Gupta
2381efab57 ARC: add Minimum allocation alignment
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2021-06-03 13:43:38 -07:00
David Goldblatt
36c6bfb963 SEC: Allow arbitrarily many shards, cached sizes. 2021-05-22 08:17:41 -07:00
David Goldblatt
5417938215 Red-black tree: add summarize/filter.
This allows tracking extra information in the nodes of an red-black tree to
filter searches in the tree to just those that match some property.
2021-05-12 11:14:23 -07:00
David Goldblatt
aea91b8c33 Clean up some minor data structure inconsistencies
Namely, unify the include guard styling with the majority of the project, and do
flat_bitmap -> fb, to match its naming convention.
2021-05-12 11:14:23 -07:00
Qi Wang
7dc77527ba Delete the mutex_pool module. 2021-03-29 17:19:53 -07:00
Qi Wang
3093d9455e Move the edata mergeability related functions to extent.h. 2021-03-29 17:19:53 -07:00
Qi Wang
7c964b0352 Add rtree_write_range(): writing the same content to multiple leaf elements.
Apply to emap_(de)register_interior which became noticeable in perf profiles.
2021-03-29 17:19:53 -07:00
Qi Wang
add636596a Stop checking head state in the merge hook.
Now that all merging go through try_acquire_edata_neighbor, the mergeablility
checks (including head state checking) are done before reaching the merge hook.
In other words, merge hook will never be called if the head state doesn't agree.
2021-03-29 17:19:53 -07:00
Qi Wang
49b7d7f0a4 Passing down the original edata on the expand path.
Instead of passing down the new_addr, pass down the active edata which allows us
to always use a neighbor-acquiring semantic.  In other words, this tells us both
the original edata and neighbor address.  With this change, only neighbors of a
"known" edata can be acquired, i.e. acquiring an edata based on an arbitrary
address isn't possible anymore.
2021-03-29 17:19:53 -07:00
Qi Wang
1784939688 Use rtree tracked states to protect edata outside of ecache locks.
This avoids the addr-based mutexes (i.e. the mutex_pool), and instead relies on
the metadata tracked in rtree leaf: the head state and extent_state.  Before
trying to access the neighbor edata (e.g. for coalescing), the states will be
verified first -- only neighbor edatas from the same arena and with the same
state will be accessed.
2021-03-29 17:19:53 -07:00
Qi Wang
9ea235f8fe Add witness_assert_positive_depth_to_rank(). 2021-03-29 17:19:53 -07:00
Qi Wang
4d8c22f9a5 Store edata->state in rtree leaf and make edata_t 128B aligned.
Verified that this doesn't result in any real increase of edata_t bytes
allocated.
2021-03-29 17:19:53 -07:00
Qi Wang
70d1541c5b Track extent is_head state in rtree leaf. 2021-03-29 17:19:53 -07:00
Evers Chen
a137a68252 Remove redundant declaration, pac_retain_grow_limit_get_set was declared twice in pac.h 2021-03-29 16:42:46 -07:00
Qi Wang
22be724af4 Set is_head in extent_alloc_wrapper w/ retain.
When retain is on, when extent_grow_retained failed (e.g. due to split hook
failures), we'll try extent_alloc_wrapper as the last resort.  Set the is_head
bit in that case to be consistent.  The allocated extent in that case will be
retained properly, but not merged with other extents.
2021-03-12 10:20:08 -08:00
David Goldblatt
73ca4b8ef8 HPA: Use dirtiest-first purging.
This seems to be practically beneficial, despite some pathological corner cases.
2021-02-19 15:10:54 -08:00
David Goldblatt
0f6c420f83 HPA: Make purging/hugifying more principled.
Before this change, purge/hugify decisions had several sharp edges that could
lead to pathological behavior if tuning parameters weren't carefully chosen.
It's the first of a series; this introduces basic "make every hugepage with
dirty pages purgeable" functionality, and the next commit expands that
functionality to have a smarter policy for picking hugepages to purge.

Previously, the dehugify logic would *never* dehugify a hugepage unless it was
dirtier than the dehugification threshold.  This can lead to situations in which
these pages (which themselves could never be purged) would push us above the
maximum allowed dirty pages in the shard.  This forces immediate purging of any
pages deallocated in non-hugified hugepages, which in turn places nonobvious
practical limitations on the relationships between various config settings.

Instead, we make our preference not to dehugify to purge a soft one rather than
a hard one.  We'll avoid purging them, but only so long as we can do so by
purging non-hugified pages.  If we need to purge them to satisfy our dirty page
limits, or to hugify other, more worthy candidates, we'll still do so.
2021-02-19 15:10:54 -08:00
David Goldblatt
6bddb92ad6 psset: Rename "bitmap" to "pageslab_bitmap".
It tracks pageslabs.  Soon, we'll have another bitmap (to track dirty pages)
that we want to disambiguate.

While we're here, fix an out-of-date comment.
2021-02-19 15:10:54 -08:00
David Goldblatt
154aa5fcc1 Use the flat bitmap for eset and psset bitmaps.
This is simpler (note that the eset field comment was actually incorrect!), and
slightly faster.
2021-02-19 15:10:54 -08:00
David Goldblatt
d21d5b46b6 Edata: Move sn into its own field.
This lets the bins use a fragmentation avoidance policy that matches the HPA's
(without affecting the PAC).
2021-02-19 15:10:54 -08:00
David Goldblatt
fb327368db SEC: Expand option configurability.
This change pulls the SEC options into a struct, which simplifies their handling
across various modules (e.g. PA needs to forward on SEC options from the
malloc_conf string, but it doesn't really need to know their names).  While
we're here, make some of the fixed constants configurable, and unify naming from
the configuration options to the internals.
2021-02-19 15:10:54 -08:00
David Goldblatt
cdae6706a6 SEC: Use batch fills.
Currently, this doesn't help much, since no PAI implementation supports
flushing.  This will change in subsequent commits.
2021-02-19 15:10:54 -08:00
David Goldblatt
480f3b11cd Add a batch allocation interface to the PAI.
For now, no real allocator actually implements this interface; this will change
in subsequent diffs.
2021-02-19 15:10:54 -08:00
David Goldblatt
bf448d7a5a SEC: Reduce lock hold times.
Only flush a subset of extents during flushing, and drop the lock while doing
so.
2021-02-19 15:10:54 -08:00
David Goldblatt
1944ebbe7f HPA: Implement batch deallocation.
This saves O(n) mutex locks/unlocks during SEC flush.
2021-02-19 15:10:54 -08:00
David Goldblatt
f47b4c2cd8 PAI/SEC: Add a dalloc_batch function.
This lets the SEC flush all of its items in a single call, rather than flushing
everything at once.
2021-02-19 15:10:54 -08:00
David Goldblatt
4b8870c7db SEC: Fix a comment typo. 2021-02-19 15:10:54 -08:00
Qi Wang
a11be50332 Implement opt.cache_oblivious.
Keep config.cache_oblivious for now to remain backward-compatible.
2021-02-11 11:32:01 -08:00
Qi Wang
041145c272 Report the correct and wrong sizes on sized dealloc bug detection. 2021-02-08 14:42:27 -08:00
Qi Wang
f3b2668b32 Report the offending pointer on sized dealloc bug detection. 2021-02-08 14:42:27 -08:00
David Goldblatt
edbfe6912c Inline malloc fastpath into operator new.
This saves a small but non-negligible amount of CPU in C++ programs.
2021-02-08 14:17:47 -08:00
David Goldblatt
79f81a3732 HPA: Make dirty_mult configurable. 2021-02-04 20:58:31 -08:00
David Goldblatt
32dd153796 HPA: Make dehugification threshold configurable. 2021-02-04 20:58:31 -08:00
David Goldblatt
4790db15ed HPA: make the hugification threshold configurable. 2021-02-04 20:58:31 -08:00
David Goldblatt
b3df80bc79 Pull HPA options into a containing struct.
Currently that just means max_alloc, but we're about to add more.  While we're
touching these lines anyways, tweak things to be more in line with testing.
2021-02-04 20:58:31 -08:00
David Goldblatt
bdb7307ff2 fxp: Add FXP_INIT_PERCENT
This lets us specify fxp values easily in source.
2021-02-04 20:58:31 -08:00
David Goldblatt
caef4c2868 FXP: add fxp_mul_frac.
This can multiply size_ts by a fraction without the risk of overflow.
2021-02-04 20:58:31 -08:00
David Goldblatt
56e85c0e47 HPA: Use a whole-shard purging heuristic.
Previously, we used only hpdata-local information to decide whether to purge.
2021-02-04 20:58:31 -08:00
David Goldblatt
dc886e5608 hpdata: Return the number of pages to be purged.
We'll use this in the next commit.
2021-02-04 20:58:31 -08:00
David Goldblatt
9fd9c876bb psset: keep aggregate stats.
This will let us quickly query these stats to make purging decisions quickly.
2021-02-04 20:58:31 -08:00
David Goldblatt
da63f23e68 HPA: Track pending purges/hugifies in the psset.
This finishes the refactoring of the HPA/psset interactions the past few commits
have been building towards.

Rather than the HPA removing and then reinserting hpdatas, it simply begins
updates and ends them.  These updates can set flags on the hpdata that prevent
it from being returned for certain types of requests.  For example, it can call
hpdata_alloc_allowed_set(hpdata, false) during an update, at which point the
given hpdata will no longer be returned for psset_pick_alloc requests.

This has various of benefits:
- It maintains stats correctness during purges and hugifies.
- It allows simpler and more explicit concurrency control for the various
  special cases (e.g. allocations are disallowed during purge, but not during
  hugify).
- It lets allocations and deallocations avoid disturbing the purging and
  hugification orderings.  If an hpdata "loses its place" in one of the queues
  just do to an alloc / dalloc, it can result in pathological edge cases where
  very hot, very full hugepages never get hugified  (and cold extents on the
  same hugepage as hot ones never get purged).

The key benefit though is that tracking hpdatas to be purged / hugified in a
principled way will let us do delayed purging and hugification.  Eventually this
will let us move these operations to background threads, but in the short term
the benefit is that it will let us have global purging policies (e.g. purge when
the entire arena has too many dirty pages, rather than any particular hugepage).
2021-02-04 20:58:31 -08:00
David Goldblatt
bf64557ed6 Move empty slab tracking to the psset.
We're moving towards a world in which purging decisions are less rigidly
enforced at a single-hugepage level.  In that world, it makes sense to keep
around some hpdatas which are not completely purged, in which case we'll need to
track them.
2021-02-04 20:58:31 -08:00
David Goldblatt
99fc0717e6 psset: Reconceptualize insertion/removal.
Really, this isn't a functional change, just a naming change.  We start thinking
of pageslabs as being always in the psset.  What we used to think of as removal
is now thought of as being in the psset, but in the process of being updated
(and therefore, unavalable for serving new allocations).

This is in preparation of subsequent changes to support deferred purging;
allocations will still be in the psset for the purposes of choosing when to
purge, but not for purposes of allocation/deallocation.
2021-02-04 20:58:31 -08:00
David Goldblatt
d3e5ea03c5 HPA: Track dirty stats. 2021-02-04 20:58:31 -08:00
David Goldblatt
68a1666e91 hpdata: Rename "dirty" to "touched".
This matches the usage in the rest of the codebase.
2021-02-04 20:58:31 -08:00
David Goldblatt
be0d7a53f3 HPA: Don't track inactive pages.
This is really only useful for human consumption.  Correspondingly, emit it only
in the human-readable stats, and let everybody else compute from the hugepage
size and nactive.
2021-02-04 20:58:31 -08:00
David Goldblatt
55e0f60ca1 psset stats: Simplify handling.
We can treat the huge and nonhuge cases uniformly using huge state as an array
index.
2021-02-04 20:58:31 -08:00
David Goldblatt
94cd9444c5 HPA: Some minor reformattings. 2021-02-04 20:58:31 -08:00
David Goldblatt
b25ee5d88e HPA: Add purge stats. 2021-02-04 20:58:31 -08:00
David Goldblatt
746ea3de6f HPA stats: Allow some derived stats.
However, we put them in their own struct, to avoid the messiness that the arena
has (mixing derived and non-derived stats in the arena_stats_t).
2021-02-04 20:58:31 -08:00
David Goldblatt
30b9e8162b HPA: Generalize purging.
Previously, we would purge a hugepage only when it's completely empty.  With
this change, we can purge even when only partially empty.  Although the
heuristic here is still fairly primitive, this infrastructure can scale to
become more advanced.
2021-02-04 20:58:31 -08:00
David Goldblatt
70692cfb13 hpdata: Add state changing helpers.
We're about to allow hugepage subextent purging; get as much of our metadata
handling ready as possible.
2021-02-04 20:58:31 -08:00
David Goldblatt
9b75808be1 flat bitmap: Add a bitwise and/or/not.
We're about to need them.
2021-02-04 20:58:31 -08:00
David Goldblatt
2ae966222f hpdata: track per-page dirty state. 2021-02-04 20:58:31 -08:00
David Goldblatt
ff4086aa6b hpdata: count active pages instead of free ones.
This will be more consistent with later naming choices.
2021-02-04 20:58:31 -08:00
David Goldblatt
3624dd42ff hpdata: Add a comment for hpdata_consistent. 2021-02-04 20:58:31 -08:00
David Goldblatt
20140629b4 Bin: Move stats closer to the mutex.
This is a slight cache locality optimization.
2021-02-04 14:10:43 -08:00
David Goldblatt
c259323ab3 Use ticker_geom_t for arena tcache decay. 2021-02-04 14:10:43 -08:00
David Goldblatt
8edfc5b170 Add ticker_geom_t.
This lets a single ticker object drive events across a large number of different
tick streams while sharing state.
2021-02-04 14:10:43 -08:00
David Goldblatt
3967329813 Arena: share bin offsets in a global.
This saves us a cache miss when lookup up the arena bin offset in a remote
arena during tcache flush.  All arenas share the base offset, and so we don't
need to look it up repeatedly for each arena.  Secondarily, it shaves 288 bytes
off the arena on, e.g., x86-64.
2021-02-04 14:10:43 -08:00
David Goldblatt
2fcbd18115 Cache bin: Don't reverse flush order.
The items we pick to flush matter a lot, but the order in which they get flushed
doesn't; just use forward scans.  This simplifies the accessing code, both in
terms of the C and the generated assembly (i.e. this speeds up the flush
pathways).
2021-02-04 14:10:43 -08:00
David Goldblatt
4c46e11365 Cache an arena's index in the arena.
This saves us a pointer hop down some perf-sensitive paths.
2021-02-04 14:10:43 -08:00
David Goldblatt
229994a204 Tcache flush: keep common path state in registers.
By carefully force-inlining the division constants and the operation sum count,
we can eliminate redundant operations in the arena-level dalloc function.  Do
so.
2021-02-04 14:10:43 -08:00
David Goldblatt
31a629c3de Tcache flush: prefetch edata contents.
This frontloads more of the miss latency.  It also moves it to a pathway where
we have not yet acquired any locks, so that it should (hopefully) reduce hold
times.
2021-02-04 14:10:43 -08:00
David Goldblatt
9f9247a62e Tcache fluhing: increase cache miss parallelism.
In practice, many rtree_leaf_elm accesses are cache misses.  By restructuring,
we can make it more likely that these misses occur without blocking us from
starting later lookups, taking more of those misses in parallel.
2021-02-04 14:10:43 -08:00
David Goldblatt
181ba7fd4d Tcache flush: Add an emap "batch lookup" path.
For now this is a no-op; but the interface is a little more flexible for our
purposes.
2021-02-04 14:10:43 -08:00
David CARLIER
35a8552605 Mac OS: Tag mapped pages.
This can be used to help profiling tools (e.g. vmmap) identify the
sources of mappings more specifically.
2021-02-03 15:05:53 -08:00
Azat Khuzhin
a943172b73 Add runtime detection for MADV_DONTNEED zeroes pages (mostly for qemu)
qemu does not support this, yet [1], and you can get very tricky assert
if you will run program with jemalloc in use under qemu:

    <jemalloc>: ../contrib/jemalloc/src/extent.c:1195: Failed assertion: "p[i] == 0"

  [1]: https://patchwork.kernel.org/patch/10576637/

Here is a simple example that shows the problem [2]:

    // Gist to check possible issues with MADV_DONTNEED
    // For example it does not supported by qemu user
    // There is a patch for this [1], but it hasn't been applied.
    //   [1]: https://lists.gnu.org/archive/html/qemu-devel/2018-08/msg05422.html

    #include <sys/mman.h>
    #include <stdio.h>
    #include <stddef.h>
    #include <assert.h>
    #include <string.h>

    int main(int argc, char **argv)
    {
        void *addr = mmap(NULL, 1<<16, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
        if (addr == MAP_FAILED) {
            perror("mmap");
            return 1;
        }
        memset(addr, 'A', 1<<16);

        if (!madvise(addr, 1<<16, MADV_DONTNEED)) {
            puts("MADV_DONTNEED does not return error. Check memory.");
            for (int i = 0; i < 1<<16; ++i) {
                assert(((unsigned char *)addr)[i] == 0);
            }
        } else {
            perror("madvise");
        }

        if (munmap(addr, 1<<16)) {
            perror("munmap");
            return 1;
        }

        return 0;
    }

  ### unpatched qemu

      $ qemu-x86_64-static /tmp/test-MADV_DONTNEED
      MADV_DONTNEED does not return error. Check memory.
      test-MADV_DONTNEED: /tmp/test-MADV_DONTNEED.c:19: main: Assertion `((unsigned char *)addr)[i] == 0' failed.
      qemu: uncaught target signal 6 (Aborted) - core dumped
      Aborted (core dumped)

  ### patched qemu (by returning ENOSYS error)

      $ qemu-x86_64 /tmp/test-MADV_DONTNEED
      madvise: Success

  ### patch for qemu to return ENOSYS

      diff --git a/linux-user/syscall.c b/linux-user/syscall.c
      index 897d20c076..5540792e0e 100644
      --- a/linux-user/syscall.c
      +++ b/linux-user/syscall.c
      @@ -11775,7 +11775,7 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
                  turns private file-backed mappings into anonymous mappings.
                  This will break MADV_DONTNEED.
                  This is a hint, so ignoring and returning success is ok.  */
      -        return 0;
      +        return ENOSYS;
       #endif
       #ifdef TARGET_NR_fcntl64
           case TARGET_NR_fcntl64:

  [2]: https://gist.github.com/azat/12ba2c825b710653ece34dba7f926ece

v2:
- review fixes
- add opt_dont_trust_madvise
v3:
- review fixes
- rename opt_dont_trust_madvise to opt_trust_madvise
2021-01-20 20:08:30 -08:00
David Goldblatt
a011c4c22d cache_bin: Separate out local and remote accesses.
This fixes an incorrect debug-mode assert:
- T1 starts an arena stats update and reads stack_head from another thread's
  cache bin, when that cache bin has 1 item in it.
- T2 allocates from that cache bin.  The cache_bin's stack_head now points to a
  NULL pointer, since the cache bin is empty.
- T1 Re-reads the cache_bin's stack_head to perform an assertion check (since it
  previously saw that the bin was empty, whatever stack_head points to should be
  non-NULL).
2021-01-08 14:18:08 -08:00
Yinan Zhang
14d689c0f9 Add prof stats mutex stats 2021-01-07 20:39:49 -08:00
Yinan Zhang
40fa4d29d3 Track per size class internal fragmentation 2021-01-07 20:39:49 -08:00
Yinan Zhang
afa489c3c5 Record request size in prof info 2021-01-07 20:39:49 -08:00
David Goldblatt
a9fa2defdb Add JEMALLOC_COLD, and mark some functions cold.
This hints to the compiler that it should care more about space than CPU (among
other things).  In cases where the compiler lacks profile-guided information,
this can be a substantial space savings.

For now, we mark the mallctl or atexit driven profiling and stats functions that
take up the most space.
2021-01-04 14:55:49 -08:00
Yinan Zhang
b35ac00d58 Do not bump to large size for page aligned request 2020-12-29 17:09:58 -08:00
Yinan Zhang
8a56d6b636 Add last-N mutex stats 2020-12-29 09:44:19 -08:00
Yinan Zhang
74bd63b203 Optimize stats print using partial name-to-mib 2020-12-18 10:39:58 -08:00
Yinan Zhang
4557c0a67d Enable ctl on partial mib and partial name 2020-12-18 10:39:58 -08:00
Yinan Zhang
006dd0414e Add partial name-to-mib functionality 2020-12-18 10:39:58 -08:00
Jin Qian
26c1dc5a3a Support AutoConf for posix_madvise and POSIX_MADV_DONTNEED 2020-12-18 10:05:59 -08:00
Jin Qian
96a59c3bb5 Fix recursive malloc during bootstrap on QNX
pthread_key_create on QNX triggers recursive allocation during tsd
bootstrapping. Using tsd_init_check_recursion to detect that.

Before pthread_key_create, the address of tsd_boot_wrapper is returned
from tsd_get_wrapper instead of using TLS to store the pointer.
tsd_set_wrapper becomes a no-op. After that, the address of
tsd_boot_wrapper is written to TLS and bootstrap continues as before.

Signed-off-by: Jin Qian <jqian@aurora.tech>
2020-12-18 10:05:59 -08:00
David Goldblatt
1e3b8636ff HPA: Remove unused malloc_conf options. 2020-12-08 12:10:48 -08:00
David Goldblatt
a559caf74a hpdata: Strengthen assertions.
Now that we have flat bitmap bit counting functions, we can easily assert that
nfree is always correct.  While we're tightening up this code, enforce
consistency on API boundaries as well.
2020-12-07 06:21:08 -08:00
David Goldblatt
54c94c1679 flat bitmap: add scount / ucount functions.
These can compute the number or set or unset bits in a subrange of the bitmap.
2020-12-07 06:21:08 -08:00
David Goldblatt
e6c057ad35 fb: implement assign in terms of a visitor.
We'll reuse this visitor in the next commit.
2020-12-07 06:21:08 -08:00
David Goldblatt
734e72ce8f bit_util: Guarantee popcount's presence.
Implement popcount generically, so that we can rely on it being present.
2020-12-07 06:21:08 -08:00
David Goldblatt
d9f7e6c668 hpdata: Add a test.
We're about to make the functionality here more complicated; testing hpdata
directly (rather than relying on user's tests) will make debugging easier.
2020-12-07 06:21:08 -08:00
David Goldblatt
3ed0b4e8a3 HPA: Add an nevictions counter.
I.e. the number of times we've purged a hugepage-sized region.
2020-12-07 06:21:08 -08:00
David Goldblatt
f7cf23aa4d psset: Relegate alloc/dalloc to test code.
This is no longer part of the "core" functionality; we only need the stub
implementations as an end-to-end test of hpdata + psset interactions when
metadata is being modified.  Treat them accordingly.
2020-12-07 06:21:08 -08:00
David Goldblatt
0971e1e4e3 hpdata: Use addr/size instead of begin/npages.
This is easier for the users of the hpdata.
2020-12-07 06:21:08 -08:00
David Goldblatt
5228d869ee psset: Use fit/insert/remove as basis functions.
All other functionality can be implemented in terms of these; doing so (while
retaining the same API) will be convenient for subsequent refactors.
2020-12-07 06:21:08 -08:00
David Goldblatt
089f8fa442 Move hpdata bitmap logic out of the psset. 2020-12-07 06:21:08 -08:00
David Goldblatt
ca30b5db2b Introduce hpdata_t.
Using an edata_t both for hugepages and the allocations within those hugepages
was convenient at first, but has outlived its usefulness.  Representing
hugepages explicitly, with their own data structure, will make future
development easier.
2020-12-07 06:21:08 -08:00
David Goldblatt
43af63fff4 HPA: Manage whole hugepages at a time.
This redesigns the HPA implementation to allow us to manage hugepages all at
once, locally, without relying on a global fallback.
2020-12-07 06:21:08 -08:00
David Goldblatt
63677dde63 Pages: Statically detect if pages_huge may succeed 2020-12-07 06:21:08 -08:00