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From: Max Reitz <mreitz@redhat.com>
To: qemu-block@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>,
	Peter Maydell <peter.maydell@linaro.org>,
	qemu-devel@nongnu.org, Max Reitz <mreitz@redhat.com>
Subject: [PULL 24/36] file-posix: account discard operations
Date: Thu, 10 Oct 2019 13:42:48 +0200
Message-ID: <20191010114300.7746-25-mreitz@redhat.com> (raw)
In-Reply-To: <20191010114300.7746-1-mreitz@redhat.com>

From: Anton Nefedov <anton.nefedov@virtuozzo.com>

This will help to identify how many of the user-issued discard operations
(accounted on a device level) have actually suceeded down on the host file
(even though the numbers will not be exactly the same if non-raw format
driver is used (e.g. qcow2 sending metadata discards)).

Note that these numbers will not include discards triggered by
write-zeroes + MAY_UNMAP calls.

Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20190923121737.83281-9-anton.nefedov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/file-posix.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/block/file-posix.c b/block/file-posix.c
index f12c06de2d..f3934c4e10 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -161,6 +161,11 @@ typedef struct BDRVRawState {
     bool needs_alignment;
     bool drop_cache;
     bool check_cache_dropped;
+    struct {
+        uint64_t discard_nb_ok;
+        uint64_t discard_nb_failed;
+        uint64_t discard_bytes_ok;
+    } stats;
 
     PRManager *pr_mgr;
 } BDRVRawState;
@@ -2660,11 +2665,22 @@ static void coroutine_fn raw_co_invalidate_cache(BlockDriverState *bs,
 #endif /* !__linux__ */
 }
 
+static void raw_account_discard(BDRVRawState *s, uint64_t nbytes, int ret)
+{
+    if (ret) {
+        s->stats.discard_nb_failed++;
+    } else {
+        s->stats.discard_nb_ok++;
+        s->stats.discard_bytes_ok += nbytes;
+    }
+}
+
 static coroutine_fn int
 raw_do_pdiscard(BlockDriverState *bs, int64_t offset, int bytes, bool blkdev)
 {
     BDRVRawState *s = bs->opaque;
     RawPosixAIOData acb;
+    int ret;
 
     acb = (RawPosixAIOData) {
         .bs             = bs,
@@ -2678,7 +2694,9 @@ raw_do_pdiscard(BlockDriverState *bs, int64_t offset, int bytes, bool blkdev)
         acb.aio_type |= QEMU_AIO_BLKDEV;
     }
 
-    return raw_thread_pool_submit(bs, handle_aiocb_discard, &acb);
+    ret = raw_thread_pool_submit(bs, handle_aiocb_discard, &acb);
+    raw_account_discard(s, bytes, ret);
+    return ret;
 }
 
 static coroutine_fn int
@@ -3301,10 +3319,12 @@ static int fd_open(BlockDriverState *bs)
 static coroutine_fn int
 hdev_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
 {
+    BDRVRawState *s = bs->opaque;
     int ret;
 
     ret = fd_open(bs);
     if (ret < 0) {
+        raw_account_discard(s, bytes, ret);
         return ret;
     }
     return raw_do_pdiscard(bs, offset, bytes, true);
-- 
2.21.0



  parent reply index

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-10 11:42 [PULL 00/36] Block patches Max Reitz
2019-10-10 11:42 ` [PULL 01/36] qemu-iotests: ignore leaks on failure paths in 026 Max Reitz
2019-10-10 11:42 ` [PULL 02/36] block: introduce aio task pool Max Reitz
2019-10-10 11:42 ` [PULL 03/36] block/qcow2: refactor qcow2_co_preadv_part Max Reitz
2019-10-10 11:42 ` [PULL 04/36] block/qcow2: refactor qcow2_co_pwritev_part Max Reitz
2019-10-10 11:42 ` [PULL 05/36] block/qcow2: introduce parallel subrequest handling in read and write Max Reitz
2019-10-10 11:42 ` [PULL 06/36] block/backup: fix max_transfer handling for copy_range Max Reitz
2019-10-10 11:42 ` [PULL 07/36] block/backup: fix backup_cow_with_offload for last cluster Max Reitz
2019-10-10 11:42 ` [PULL 08/36] block/backup: split shareable copying part from backup_do_cow Max Reitz
2019-10-10 11:42 ` [PULL 09/36] block/backup: improve comment about image fleecing Max Reitz
2019-10-10 11:42 ` [PULL 10/36] block/backup: introduce BlockCopyState Max Reitz
2019-10-10 11:42 ` [PULL 11/36] block/backup: fix block-comment style Max Reitz
2019-10-10 11:42 ` [PULL 12/36] block: move block_copy from block/backup.c to separate file Max Reitz
2019-10-10 11:42 ` [PULL 13/36] block: teach bdrv_debug_breakpoint skip filters with backing Max Reitz
2019-10-10 11:42 ` [PULL 14/36] iotests: prepare 124 and 257 bitmap querying for backup-top filter Max Reitz
2019-10-10 11:42 ` [PULL 15/36] iotests: 257: drop unused Drive.device field Max Reitz
2019-10-10 11:42 ` [PULL 16/36] iotests: 257: drop device_add Max Reitz
2019-10-10 11:42 ` [PULL 17/36] qapi: group BlockDeviceStats fields Max Reitz
2019-10-10 11:42 ` [PULL 18/36] qapi: add unmap to BlockDeviceStats Max Reitz
2019-10-10 11:42 ` [PULL 19/36] block: add empty account cookie type Max Reitz
2019-10-10 11:42 ` [PULL 20/36] ide: account UNMAP (TRIM) operations Max Reitz
2019-10-10 11:42 ` [PULL 21/36] scsi: store unmap offset and nb_sectors in request struct Max Reitz
2019-10-10 11:42 ` [PULL 22/36] scsi: move unmap error checking to the complete callback Max Reitz
2019-10-10 11:42 ` [PULL 23/36] scsi: account unmap operations Max Reitz
2019-10-10 11:42 ` Max Reitz [this message]
2019-10-10 11:42 ` [PULL 25/36] qapi: query-blockstat: add driver specific file-posix stats Max Reitz
2019-10-10 11:42 ` [PULL 26/36] iotests: Fix 125 for growth_mode = metadata Max Reitz
2019-10-10 11:42 ` [PULL 27/36] iotests: Disable 125 on broken XFS versions Max Reitz
2019-10-10 11:42 ` [PULL 28/36] iotests: Use stat -c %b in 125 Max Reitz
2019-10-10 11:42 ` [PULL 29/36] block/backup: move in-flight requests handling from backup to block-copy Max Reitz
2019-10-10 11:42 ` [PULL 30/36] block/backup: move write_flags calculation inside backup_job_create Max Reitz
2019-10-10 11:42 ` [PULL 31/36] block/block-copy: split block_copy_set_callbacks function Max Reitz
2019-10-10 11:42 ` [PULL 32/36] block: introduce backup-top filter driver Max Reitz
2019-10-10 11:42 ` [PULL 33/36] block/backup: use backup-top instead of write notifiers Max Reitz
2019-10-17 12:04   ` Peter Maydell
2019-10-17 13:40     ` Vladimir Sementsov-Ogievskiy
2019-10-10 11:42 ` [PULL 34/36] nbd: add empty .bdrv_reopen_prepare Max Reitz
2019-10-10 11:42 ` [PULL 35/36] tests: fix I/O test for hosts defaulting to LUKSv2 Max Reitz
2019-10-10 11:43 ` [PULL 36/36] iotests/162: Fix for newer Linux 5.3+ Max Reitz
2019-10-14 12:34 ` [PULL 00/36] Block patches Peter Maydell

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