[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PULL 13/21] ram.c: Reset result after sending queued data
From: |
Juan Quintela |
Subject: |
[PULL 13/21] ram.c: Reset result after sending queued data |
Date: |
Fri, 28 Apr 2023 21:11:55 +0200 |
From: Lukas Straub <lukasstraub2@web.de>
And take the param->mutex lock for the whole section to ensure
thread-safety.
Now, it is explicitly clear if there is no queued data to send.
Before, this was handled by param->file stream being empty and thus
qemu_put_qemu_file() not sending anything.
This will be used in the next commits to move save_page_header()
out of compress code.
Signed-off-by: Lukas Straub <lukasstraub2@web.de>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
migration/ram.c | 32 ++++++++++++++++++++++----------
1 file changed, 22 insertions(+), 10 deletions(-)
diff --git a/migration/ram.c b/migration/ram.c
index ebcde3dcd4..b0b11f37fb 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1508,6 +1508,13 @@ update_compress_thread_counts(const CompressParam
*param, int bytes_xmit)
static bool save_page_use_compression(RAMState *rs);
+static inline void compress_reset_result(CompressParam *param)
+{
+ param->result = RES_NONE;
+ param->block = NULL;
+ param->offset = 0;
+}
+
static void flush_compressed_data(RAMState *rs)
{
MigrationState *ms = migrate_get_current();
@@ -1529,13 +1536,16 @@ static void flush_compressed_data(RAMState *rs)
for (idx = 0; idx < thread_count; idx++) {
qemu_mutex_lock(&comp_param[idx].mutex);
if (!comp_param[idx].quit) {
- len = qemu_put_qemu_file(ms->to_dst_file, comp_param[idx].file);
+ CompressParam *param = &comp_param[idx];
+ len = qemu_put_qemu_file(ms->to_dst_file, param->file);
+ compress_reset_result(param);
+
/*
* it's safe to fetch zero_page without holding comp_done_lock
* as there is no further request submitted to the thread,
* i.e, the thread should be waiting for a request at this point.
*/
- update_compress_thread_counts(&comp_param[idx], len);
+ update_compress_thread_counts(param, len);
}
qemu_mutex_unlock(&comp_param[idx].mutex);
}
@@ -1560,15 +1570,17 @@ static int compress_page_with_multi_thread(RAMBlock
*block, ram_addr_t offset)
retry:
for (idx = 0; idx < thread_count; idx++) {
if (comp_param[idx].done) {
- comp_param[idx].done = false;
- bytes_xmit = qemu_put_qemu_file(ms->to_dst_file,
- comp_param[idx].file);
- qemu_mutex_lock(&comp_param[idx].mutex);
- set_compress_params(&comp_param[idx], block, offset);
- qemu_cond_signal(&comp_param[idx].cond);
- qemu_mutex_unlock(&comp_param[idx].mutex);
+ CompressParam *param = &comp_param[idx];
+ qemu_mutex_lock(¶m->mutex);
+ param->done = false;
+ bytes_xmit = qemu_put_qemu_file(ms->to_dst_file, param->file);
+ compress_reset_result(param);
+ set_compress_params(param, block, offset);
+
+ update_compress_thread_counts(param, bytes_xmit);
+ qemu_cond_signal(¶m->cond);
+ qemu_mutex_unlock(¶m->mutex);
pages = 1;
- update_compress_thread_counts(&comp_param[idx], bytes_xmit);
break;
}
}
--
2.40.0
- [PULL 04/21] migration: Rename RAMStats to MigrationAtomicStats, (continued)
- [PULL 04/21] migration: Rename RAMStats to MigrationAtomicStats, Juan Quintela, 2023/04/28
- [PULL 07/21] migration: Drop unused parameter for migration_tls_get_creds(), Juan Quintela, 2023/04/28
- [PULL 05/21] migration/rdma: Split the zero page case from acct_update_position, Juan Quintela, 2023/04/28
- [PULL 06/21] migration/rdma: Unfold last user of acct_update_position(), Juan Quintela, 2023/04/28
- [PULL 08/21] migration: Drop unused parameter for migration_tls_client_create(), Juan Quintela, 2023/04/28
- [PULL 10/21] qtest/migration-test.c: Add postcopy tests with compress enabled, Juan Quintela, 2023/04/28
- [PULL 09/21] qtest/migration-test.c: Add tests with compress enabled, Juan Quintela, 2023/04/28
- [PULL 11/21] ram.c: Let the compress threads return a CompressResult enum, Juan Quintela, 2023/04/28
- [PULL 14/21] ram.c: Do not call save_page_header() from compress threads, Juan Quintela, 2023/04/28
- [PULL 12/21] ram.c: Dont change param->block in the compress thread, Juan Quintela, 2023/04/28
- [PULL 13/21] ram.c: Reset result after sending queued data,
Juan Quintela <=
- [PULL 16/21] ram.c: Remove last ram.c dependency from the core compress code, Juan Quintela, 2023/04/28
- [PULL 15/21] ram.c: Call update_compress_thread_counts from compress_send_queued_data, Juan Quintela, 2023/04/28
- [PULL 18/21] ram.c: Move core decompression code into its own file, Juan Quintela, 2023/04/28
- [PULL 19/21] ram compress: Assert that the file buffer matches the result, Juan Quintela, 2023/04/28
- [PULL 17/21] ram.c: Move core compression code into its own file, Juan Quintela, 2023/04/28
- [PULL 21/21] migration: Initialize and cleanup decompression in migration.c, Juan Quintela, 2023/04/28
- [PULL 20/21] ram-compress.c: Make target independent, Juan Quintela, 2023/04/28
- Re: [PULL 00/21] Migration 20230428 patches, Richard Henderson, 2023/04/29